Maize variety inbred PHWRZ

ABSTRACT

A novel maize variety designated PHWRZ and seed, plants and plant parts thereof. Methods for producing a maize plant that comprise crossing maize variety PHWRZ with another maize plant. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PHWRZ through backcross conversion and/or transformation, and to the maize seed, plant and plant part produced thereby. Hybrid maize seed, plant or plant part produced by crossing the variety PHWRZ or a locus conversion of PHWRZ with another maize variety.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority under 35 U.S.C. §119(e) to provisionalapplication Ser. No. 61/152,777 filed Feb. 16, 2009, herein incorporatedby reference in its entirety.

FIELD OF THE INVENTION

This invention relates generally to the field of maize breeding,specifically relating to a maize variety designated PHWRZ.

BACKGROUND OF THE INVENTION

The goal of plant breeding is to combine, in a single variety or hybrid,various desirable traits. For field crops, these traits may includeresistance to diseases and insects, resistance to heat and drought,reducing the time to crop maturity, greater yield, and better agronomicquality. With mechanical harvesting of many crops, uniformity of plantcharacteristics such as germination, stand establishment, growth rate,maturity, plant height and ear height, is important. Traditional plantbreeding is an important tool in developing new and improved commercialcrops.

SUMMARY OF THE INVENTION

According to the invention, there is provided a novel maize variety,designated PHWRZ and processes for making PHWRZ. This invention relatesto seed of maize variety PHWRZ, to the plants of maize variety PHWRZ, toplant parts of maize variety PHWRZ, and to processes for making a maizeplant that comprise crossing maize variety PHWRZ with another maizeplant. This invention also relates to processes for making a maize plantcontaining in its genetic material one or more traits introgressed intoPHWRZ through backcross conversion and/or transformation, and to themaize seed, plant and plant parts produced thereby. This inventionfurther relates to a hybrid maize seed, plant or plant part produced bycrossing the variety PHWRZ or a locus conversion of PHWRZ with anothermaize variety.

DEFINITIONS

Certain definitions used in the specification are provided below. Alsoin the examples that follow, a number of terms are used herein. In orderto provide a clear and consistent understanding of the specification andclaims, including the scope to be given such terms, the followingdefinitions are provided. NOTE: ABS is in absolute terms and % MN ispercent of the mean for the experiments in which the inbred or hybridwas grown. PCT designates that the trait is calculated as a percentage.% NOT designates the percentage of plants that did not exhibit a trait.For example, STKLDG % NOT is the percentage of plants in a plot thatwere not stalk lodged. These designators will follow the descriptors todenote how the values are to be interpreted. Below are the descriptorsused in the data tables included herein.

ABIOTIC STRESS TOLERANCE: resistance to non-biological sources of stressconferred by traits such as nitrogen utilization efficiency, alterednitrogen responsiveness, drought resistance, cold, and salt resistance

ABTSTK=ARTIFICIAL BRITTLE STALK: A count of the number of “snapped”plants per plot following machine snapping. A snapped plant has itsstalk completely snapped at a node between the base of the plant and thenode above the ear. Expressed as percent of plants that did not snap.

ALLELE: Any of one or more alternative forms of a genetic sequence. In adiploid cell or organism, the two alleles of a given sequence typicallyoccupy corresponding loci on a pair of homologous chromosomes.

ALTER: The utilization of up-regulation, down-regulation, or genesilencing.

ANTHESIS: The time of a flower's opening.

ANTIOXIDANT: A chemical compound or substance that inhibits oxidation,including but not limited to tocopherol or tocotrienols.

ANT ROT=ANTHRACNOSE STALK ROT (Colletotrichum graminicola): A 1 to 9visual rating indicating the resistance to Anthracnose Stalk Rot. Ahigher score indicates a higher resistance. Data are collected only whensufficient selection pressure exists in the experiment measured.

BACKCROSSING: Process in which a breeder crosses a hybrid progenyvariety back to one of the parental genotypes one or more times.

BACKCROSS PROGENY: Progeny plants produced by crossing PHWRZ with plantsof another maize line that comprise a desired trait or locus, selectingF1 progeny plants that comprise the desired trait or locus, and crossingthe selected F1 progeny plants with the PHWRZ plants 1 or more times toproduce backcross progeny plants that comprise said trait or locus.

BARPLT=BARREN PLANTS: The percent of plants per plot that were notbarren (lack ears).

BORBMN=ARTIFICIAL BRITTLE STALK MEAN: The mean percent of plants not“snapped” in a plot following artificial selection pressure. A snappedplant has its stalk completely snapped at a node between the base of theplant and the node above the ear. Expressed as percent of plants thatdid not snap. A high number is good and indicates tolerance to brittlesnapping.

BRENGMN=BRITTLE STALK ENERGY MEAN: The mean amount of energy per unitarea needed to artificially brittle snap a corn stalk. A high number isgood and indicates tolerance to brittle snapping.

BREEDING: The genetic manipulation of living organisms.

BREEDING CROSS: A cross to introduce new genetic material into a plantfor the development of a new variety. For example, one could cross plantA with plant B, wherein plant B would be genetically different fromplant A. After the breeding cross, the resulting F1 plants could then beselfed or sibbed for one, two, three or more times (F1, F2, F3, etc.)until a new inbred variety is developed.

BRLPNE=ARTIFICIAL ROOT LODGING EARLY SEASON: The percent of plants notroot lodged in a plot following artificial selection pressure appliedprior to flowering. A plant is considered root lodged if it leans fromthe vertical axis at an approximately 30 degree angle or greater.Expressed as percent of plants that did not root lodge. A high number isgood and indicates tolerance to root lodging.

BRLPNL=ARTIFICIAL ROOT LODGING LATE SEASON: The percent of plants notroot lodged in a plot following artificial selection pressure duringgrain fill. A plant is considered root lodged if it leans from thevertical axis at an approximately 30 degree angle or greater. Expressedas percent of plants that did not root lodge. A high number is good andindicates tolerance to root lodging.

BRTSTK=BRITTLE STALKS: This is a measure of the stalk breakage near thetime of pollination, and is an indication of whether a hybrid or inbredwould snap or break near the time of flowering under severe winds. Dataare presented as percentage of plants that did not snap. Data arecollected only when sufficient selection pressure exists in theexperiment measured.

CARBOHYDRATE: Organic compounds comprising carbon, oxygen and hydrogen,including sugars, starches and cellulose.

CELL: Cell as used herein includes a plant cell, whether isolated, intissue culture or incorporated in a plant or plant part.

CLDTST=COLD TEST: The percent of plants that germinate under cold testconditions.

CLN=CORN LETHAL NECROSIS: Synergistic interaction of maize chloroticmottle virus (MCMV) in combination with either maize dwarf mosaic virus(MDMV-A or MDMV-B) or wheat streak mosaic virus (WSMV). A 1 to 9 visualrating indicating the resistance to Corn Lethal Necrosis. A higher scoreindicates a higher resistance. Data are collected only when sufficientselection pressure exists in the experiment measured.

COMRST=COMMON RUST (Puccinia sorghi): A 1 to 9 visual rating indicatingthe resistance to Common Rust. A higher score indicates a higherresistance. Data are collected only when sufficient selection pressureexists in the experiment measured.

CROSS POLLINATION: Fertilization by the union of two gametes fromdifferent plants.

CROSSING: The combination of genetic material by traditional methodssuch as a breeding cross or backcross, but also including protoplastfusion and other molecular biology methods of combining genetic materialfrom two sources.

D/D=DRYDOWN: This represents the relative rate at which a hybrid willreach acceptable harvest moisture compared to other hybrids on a 1 to 9rating scale. A high score indicates a hybrid that dries relatively fastwhile a low score indicates a hybrid that dries slowly.

DIPERS=DIPLODIA EAR MOLD SCORES (Diplodia maydis and Diplodiamacrospora): A 1 to 9 visual rating indicating the resistance toDiplodia Ear Mold. A higher score indicates a higher resistance. Dataare collected only when sufficient selection pressure exists in theexperiment measured.

DIPLOID PLANT PART: Refers to a plant part or cell that has the samediploid genotype as PHWRZ.

DIPROT=DIPLODIA STALK ROT SCORE: Score of stalk rot severity due toDiplodia (Diplodia maydis). Expressed as a 1 to 9 score with 9 beinghighly resistant. Data are collected only when sufficient selectionpressure exists in the experiment measured.

DRPEAR=DROPPED EARS: A measure of the number of dropped ears per plotand represents the percentage of plants that did not drop ears prior toharvest. Data are collected only when sufficient selection pressureexists in the experiment measured.

D/T=DROUGHT TOLERANCE: This represents a 1 to 9 rating for droughttolerance, and is based on data obtained under stress conditions. A highscore indicates good drought tolerance and a low score indicates poordrought tolerance. Data are collected only when sufficient selectionpressure exists in the experiment measured.

EARHT=EAR HEIGHT: The ear height is a measure from the ground to thehighest placed developed ear node attachment and is measured incentimeters.

EARMLD=GENERAL EAR MOLD: Visual rating (1 to 9 score) where a 1 is verysusceptible and a 9 is very resistant. This is based on overall ratingfor ear mold of mature ears without determining the specific moldorganism, and may not be predictive for a specific ear mold. Data arecollected only when sufficient selection pressure exists in theexperiment measured.

EARSZ=EAR SIZE: A 1 to 9 visual rating of ear size. The higher therating the larger the ear size.

EBTSTK=EARLY BRITTLE STALK: A count of the number of “snapped” plantsper plot following severe winds when the corn plant is experiencing veryrapid vegetative growth in the V5-V8 stage. Expressed as percent ofplants that did not snap. Data are collected only when sufficientselection pressure exists in the experiment measured.

ECB1 LF=EUROPEAN CORN BORER FIRST GENERATION LEAF FEEDING (Ostrinianubilalis): A 1 to 9 visual rating indicating the resistance topreflowering leaf feeding by first generation European Corn Borer. Ahigher score indicates a higher resistance. Data are collected only whensufficient selection pressure exists in the experiment measured.

ECB2IT=EUROPEAN CORN BORER SECOND GENERATION INCHES OF TUNNELING(Ostrinia nubilalis): Average inches of tunneling per plant in thestalk. Data are collected only when sufficient selection pressure existsin the experiment measured.

ECB2SC=EUROPEAN CORN BORER SECOND GENERATION (Ostrinia nubilalis): A 1to 9 visual rating indicating post flowering degree of stalk breakageand other evidence of feeding by second generation European Corn Borer.A higher score indicates a higher resistance. Data are collected onlywhen sufficient selection pressure exists in the experiment measured.

ECBDPE=EUROPEAN CORN BORER DROPPED EARS (Ostrinia nubilalis): proppedears due to European Corn Borer. Percentage of plants that did not dropears under second generation European Corn Borer infestation. Data arecollected only when sufficient selection pressure exists in theexperiment measured.

ECBLSI=EUROPEAN CORN BORER LATE SEASON INTACT (Ostrinia nubilalis): A 1to 9 visual rating indicating late season intactness of the corn plantgiven damage (stalk breakage above and below the top ear) causedprimarily by 2^(nd) and/or 3^(rd) generation ECB larval feeding beforeharvest. A higher score is good and indicates more intact plants. Dataare collected only when sufficient selection pressure exists in theexperiment measured.

EGRWTH=EARLY GROWTH: This is a measure of the relative height and sizeof a corn seedling at the 2-4 leaf stage of growth. This is a visualrating (1 to 9), with 1 being weak or slow growth, 5 being averagegrowth and 9 being strong growth. Taller plants, wider leaves, moregreen mass and darker color constitute higher score. Data are collectedonly when sufficient selection pressure exists in the experimentmeasured.

ERTLDG=EARLY ROOT LODGING: The percentage of plants that do not rootlodge prior to or around anthesis; plants that lean from the verticalaxis at an approximately 30 degree angle or greater would be counted asroot lodged. Data are collected only when sufficient selection pressureexists in the experiment measured.

ERTLPN=EARLY ROOT LODGING: An estimate of the percentage of plants thatdo not root lodge prior to or around anthesis; plants that lean from thevertical axis at an approximately 30 degree angle or greater would beconsidered as root lodged. Data are collected only when sufficientselection pressure exists in the experiment measured.

ERTLSC=EARLY ROOT LODGING SCORE: Score for severity of plants that leanfrom a vertical axis at an approximate 30 degree angle or greater whichtypically results from strong winds prior to or around floweringrecorded within 2 weeks of a wind event. Expressed as a 1 to 9 scorewith 9 being no lodging. Data are collected only when sufficientselection pressure exists in the experiment measured.

ESSENTIAL AMINO ACIDS: Amino acids that cannot be synthesized de novo byan organism and therefore must be supplied in the diet.

ESTCNT=EARLY STAND COUNT: This is a measure of the stand establishmentin the spring and represents the number of plants that emerge on perplot basis for the inbred or hybrid.

EYESPT=EYE SPOT (Kabatiella zeae or Aureobasidium zeae): A 1 to 9 visualrating indicating the resistance to Eye Spot. A higher score indicates ahigher resistance. Data are collected only when sufficient selectionpressure exists in the experiment measured.

EXPRESSING: Having the genetic potential such that under the rightconditions, the phenotypic trait is present.

FATTY ACID: A carboxylic acid (or organic acid), often with a longaliphatic tail (long chains), either saturated or unsaturated.

F1 PROGENY: A progeny plant produced by crossing a plant of maizevariety PHWRZ with a plant of another maize line.

FUSERS=FUSARIUM EAR ROT SCORE (Fusarium moniliforme or Fusariumsubglutinans): A 1 to 9 visual rating indicating the resistance toFusarium Ear Rot. A higher score indicates a higher resistance. Data arecollected only when sufficient selection pressure exists in theexperiment measured.

GDU=GROWING DEGREE UNITS: Using the Barger Heat Unit Theory, whichassumes that maize growth occurs in the temperature range 50 degrees F.−86 degrees F. and that temperatures outside this range slow downgrowth; the maximum daily heat unit accumulation is 36 and the minimumdaily heat unit accumulation is 0. The seasonal accumulation of GDU is amajor factor in determining maturity zones.

GDUSHD=GDU TO SHED: The number of growing degree units (GDUs) or heatunits required for an inbred variety or hybrid to have approximately 50percent of the plants shedding pollen and is measured from the time ofplanting. Growing degree units are calculated by the Barger Method,where the heat units for a 24-hour period are:

${G\; D\; U} = {\frac{( {{Max}.\mspace{14mu}{temp}.{+ {{Min}.\mspace{14mu}{temp}.}}} )}{2} - 50}$

The highest maximum temperature used is 86 degrees F. and the lowestminimum temperature used is 50 degrees F. For each inbred or hybrid ittakes a certain number of GDUs to reach various stages of plantdevelopment.

GDUSLK=GDU TO SILK: The number of growing degree units required for aninbred variety or hybrid to have approximately 50 percent of the plantswith silk emergence from time of planting. Growing degree units arecalculated by the Barger Method as given in GDU SHD definition.

GENE SILENCING: The interruption or suppression of the expression of agene at the level of transcription or translation.

GENOTYPE: Refers to the genetic constitution of a cell or organism.

GIBERS=GIBBERELLA EAR ROT (PINK MOLD) (Gibberella zeae): A 1 to 9 visualrating indicating the resistance to Gibberella Ear Rot. A higher scoreindicates a higher resistance. Data are collected only when sufficientselection pressure exists in the experiment measured.

GIBROT=GIBBERELLA STALK ROT SCORE: Score of stalk rot severity due toGibberella (Gibberella zeae). Expressed as a 1 to 9 score with 9 beinghighly resistant. Data are collected only when sufficient selectionpressure exists in the experiment measured.

GLFSPT=GRAY LEAF SPOT (Cercospora zeae-maydis): A 1 to 9 visual ratingindicating the resistance to Gray Leaf Spot. A higher score indicates ahigher resistance. Data are collected only when sufficient selectionpressure exists in the experiment measured.

GOSWLT=GOSS' WILT (Corynebacterium nebraskense): A 1 to 9 visual ratingindicating the resistance to Goss' Wilt. A higher score indicates ahigher resistance. Data are collected only when sufficient selectionpressure exists in the experiment measured.

GRNAPP=GRAIN APPEARANCE: This is a 1 to 9 rating for the generalappearance of the shelled grain as it is harvested based on such factorsas the color of harvested grain, any mold on the grain, and any crackedgrain. High scores indicate good grain visual quality.

HAPLOID PLANT PART: Refers to a plant part or cell that has the samehaploid genotype as PHWRZ.

HCBLT=HELMINTHOSPORIUM CARBONUM LEAF BLIGHT (Helminthosporium carbonum):A 1 to 9 visual rating indicating the resistance to Helminthosporiuminfection. A higher score indicates a higher resistance. Data arecollected only when sufficient selection pressure exists in theexperiment measured.

HD SMT=HEAD SMUT (Sphacelotheca reiliana): This score indicates thepercentage of plants not infected. Data are collected only whensufficient selection pressure exists in the experiment measured.

HSKCVR=HUSK COVER: A 1 to 9 score based on performance relative to keychecks, with a score of 1 indicating very short husks, tip of ear andkernels showing; 5 is intermediate coverage of the ear under mostconditions, sometimes with thin husk; and a 9 has husks extending andclosed beyond the tip of the ear. Scoring can best be done nearphysiological maturity stage or any time during dry down untilharvested.

HYBRID VARIETY: A substantially heterozygous hybrid line and minorgenetic modifications thereof that retain the overall genetics of thehybrid line including but not limited to a locus conversion, a mutation,or a somoclonal variant.

INBRED: A variety developed through inbreeding or doubled haploidy thatpreferably comprises homozygous alleles at about 95% or more of itsloci.

INC D/A=GROSS INCOME (DOLLARS PER ACRE): Relative income per acreassuming drying costs of two cents per point above 15.5 percent harvestmoisture and current market price per bushel.

INCOME/ACRE: Income advantage of hybrid to be patented over other hybridon per acre basis.

INC ADV=GROSS INCOME ADVANTAGE: Gross income advantage of variety #1over variety #2.

INTROGRESSION: The process of transferring genetic material from onegenotype to another.

KERUNT=KERNELS PER UNIT AREA (Acres or Hectares).

KERPOP=KERNEL POP SCORE: The visual 1-9 rating of the amount ofrupturing of the kernel pericarp at an early stage in grain fill. Ahigher score is good and indicates no popped (ruptured) kernels.

KER_WT=KERNEL NUMBER PER UNIT WEIGHT (Pounds or Kilograms): The numberof kernels in a specific measured weight; determined after removal ofextremely small and large kernels.

KSZDCD=KERNEL SIZE DISCARD: The percent of discard seed; calculated asthe sum of discarded tip kernels and extra large kernels.

LINKAGE: Refers to a phenomenon wherein alleles on the same chromosometend to segregate together more often than expected by chance if theirtransmission was independent.

LINKAGE DISEQUILIBRIUM: Refers to a phenomenon wherein alleles tend toremain together in linkage groups when segregating from parents tooffspring, with a greater frequency than expected from their individualfrequencies.

LOCUS: A specific location on a chromosome.

LOCUS CONVERSION: A locus conversion refers to plants within a varietythat have been modified in a manner that retains the overall genetics ofthe variety and further comprises one or more loci with a specificdesired trait, such as male sterility, insect, disease or herbicideresistance. Examples of single locus conversions include mutant genes,transgenes and native traits finely mapped to a single locus. One ormore locus conversion traits may be introduced into a single cornvariety.

L/POP=YIELD AT LOW DENSITY: Yield ability at relatively low plantdensities on a 1 to 9 relative system with a higher number indicatingthe hybrid responds well to low plant densities for yield relative toother hybrids. A 1, 5, and 9 would represent very poor, average, andvery good yield response, respectively, to low plant density.

LRTLDG=LATE ROOT LODGING: The percentage of plants that do not rootlodge after anthesis through harvest; plants that lean from the verticalaxis at an approximately 30 degree angle or greater would be counted asroot lodged. Data are collected only when sufficient selection pressureexists in the experiment measured.

LRTLPN=LATE ROOT LODGING: An estimate of the percentage of plants thatdo not root lodge after anthesis through harvest; plants that lean fromthe vertical axis at an approximately 30 degree angle or greater wouldbe considered as root lodged. Data are collected only when sufficientselection pressure exists in the experiment measured.

LRTLSC=LATE ROOT LODGING SCORE: Score for severity of plants that leanfrom a vertical axis at an approximate 30 degree angle or greater whichtypically results from strong winds after flowering. Recorded prior toharvest when a root-lodging event has occurred. This lodging results inplants that are leaned or “lodged” over at the base of the plant and donot straighten or “goose-neck” back to a vertical position. Expressed asa 1 to 9 score with 9 being no lodging. Data are collected only whensufficient selection pressure exists in the experiment measured.

MALE STERILITY: A male sterile plant is one which produces no viablepollen no (pollen that is able to fertilize the egg to produce a viableseed). Male sterility prevents self pollination. These male sterileplants are therefore useful in hybrid plant production.

MDMCPX=MAIZE DWARF MOSAIC COMPLEX (MDMV=Maize Dwarf Mosaic Virus andMCDV=Maize Chlorotic Dwarf Virus). A 1 to 9 visual rating indicating theresistance to Maize Dwarf Mosaic Complex. A higher score indicates ahigher resistance. Data are collected only when sufficient selectionpressure exists in the experiment measured.

MST=HARVEST MOISTURE: The moisture is the actual percentage moisture ofthe grain at harvest.

MSTADV=MOISTURE ADVANTAGE: The moisture advantage of variety #1 overvariety #2 as calculated by: MOISTURE of variety #2−MOISTURE of variety#1=MOISTURE ADVANTAGE of variety #1.

NEI DISTANCE: A quantitative measure of percent similarity between twovarieties. Nei's distance between varieties A and B can be defined as1−(2*number alleles in common/(number alleles in A+number alleles in B).For example, if varieties A and B are the same for 95 out of 100alleles, the Nei distance would be 0.05. If varieties A and B are thesame for 98 out of 100 alleles, the Nei distance would be 0.02. Freesoftware for calculating Nei distance is available on the internet atmultiple locations such as, for example, at:evolution.genetics.washington.edu/phylip.html. See Nei, Proc Natl AcadSci, 76:5269-5273 (1979) which is incorporated by reference for thispurpose.

NLFBLT=NORTHERN LEAF BLIGHT (Helminthosporium turcicum or Exserohilumturcicum): A 1 to 9 visual rating indicating the resistance to NorthernLeaf Blight. A higher score indicates a higher resistance. Data arecollected only when sufficient selection pressure exists in theexperiment measured.

NUCLEIC ACID: An acidic, chainlike biological macromolecule consistingof multiple repeat units of phosphoric acid, sugar and purine andpyrimidine bases.

OILT=GRAIN OIL: Absolute value of oil content of the kernel as predictedby Near-Infrared Transmittance and expressed as a percent of dry matter.

PERCENT IDENTITY: Percent identity as used herein refers to thecomparison of the alleles present in two varieties. For example, whencomparing two inbred plants to each other, each inbred plant will havethe same allele (and therefore be homozygous) at almost all of theirloci. Percent identity is determined by comparing a statisticallysignificant number of the homozygous alleles of two varieties. Forexample, a percent identity of 90% between PHWRZ and other variety meansthat the two varieties have the same homozygous alleles at 90% of theirloci.

PLANT: As used herein, the term “plant” includes reference to animmature or mature whole plant, including a plant that has beendetasseled or from which seed or grain has been removed. Seed or embryothat will produce the plant is also considered to be the plant.

PLANT PART: As used herein, the term “plant part” includes leaves,stems, roots, seed, grain, embryo, pollen, ovules, flowers, ears, cobs,husks, stalks, root tips, anthers, pericarp, silk, tissue, cells and thelike.

PLTHT=PLANT HEIGHT: This is a measure of the height of the plant fromthe ground to the tip of the tassel in centimeters.

POLPRD=POLLEN PRODUCTION SCORE: The estimated total amount of pollenproduced by tassels based on the number of tassel branches and thedensity of the spikelets.

POLSC=POLLEN SCORE: A 1 to 9 visual rating indicating the amount ofpollen shed. The higher the score the more pollen shed.

POLWT=POLLEN WEIGHT: This is calculated by dry weight of tasselscollected as shedding commences minus dry weight from similar tasselsharvested after shedding is complete.

POP K/A=PLANT POPULATIONS: Measured as 1000's per acre.

POP ADV=PLANT POPULATION ADVANTAGE: The plant population advantage ofvariety #1 over variety #2 as calculated by PLANT POPULATION of variety#2−PLANT POPULATION of variety #1=PLANT POPULATION ADVANTAGE of variety#1.

PRM=PREDICTED RELATIVE MATURITY: This trait, predicted relativematurity, is based on the harvest moisture of the grain. The relativematurity rating is based on a known set of checks and utilizes standardlinear regression analyses and is also referred to as the ComparativeRelative Maturity Rating System that is similar to the MinnesotaRelative Maturity Rating System.

PRMSHD: A relative measure of the growing degree units (GDU) required toreach 50% pollen shed. Relative values are predicted values from thelinear regression of observed GDU's on relative maturity of commercialchecks.

PROT=GRAIN PROTEIN: Absolute value of protein content of the kernel aspredicted by Near-Infrared Transmittance and expressed as a percent ofdry matter.

RESISTANCE: Synonymous with tolerance. The ability of a plant towithstand exposure to an insect, disease, herbicide or other condition.A resistant plant variety will have a level of resistance higher than acomparable wild-type variety.

RTLDG=ROOT LODGING: Root lodging is the percentage of plants that do notroot lodge; plants that lean from the vertical axis at an approximately30 degree angle or greater would be counted as root lodged. Data arecollected only when sufficient selection pressure exists in theexperiment measured.

RTLADV=ROOT LODGING ADVANTAGE: The root lodging advantage of variety #1over variety #2. Data are collected only when sufficient selectionpressure exists in the experiment measured.

SCTGRN=SCATTER GRAIN: A 1 to 9 visual rating indicating the amount ofscatter grain (lack of pollination or kernel abortion) on the ear. Thehigher the score the less scatter grain.

SDGVGR=SEEDLING VIGOR: This is the visual rating (1 to 9) of the amountof vegetative growth after emergence at the seedling stage(approximately five leaves). A higher score indicates better vigor.

SEED: Fertilized and ripened ovule, consisting of the plant embryo,varying amounts of stored food material, and a protective outer seedcoat. Synonymous with grain.

SEL IND=SELECTION INDEX: The selection index gives a single measure ofthe hybrid's worth based on information for multiple traits. A maizebreeder may utilize his or her own set of traits for the selectionindex. One of the traits that is almost always included is yield. Theselection index data presented in the tables represent the mean valueaveraged across testing stations.

SELF POLLINATION: A plant is self-pollinated if pollen from one floweris transferred to the same or another flower of the same plant.

SIB POLLINATION: A plant is sib-pollinated when individuals within thesame family or variety are used for pollination.

SITE SPECIFIC INTEGRATION: Genes that create a site for site specificDNA integration. This includes the introduction of FRT sites that may beused in the FLP/FRT system and/or Lox sites that may be used in theCre/Loxp system. For example, see Lyznik, et al., Site-SpecificRecombination for Genetic Engineering in Plants, Plant Cell Rep (2003)21:925-932 and WO 99/25821.

SLFBLT=SOUTHERN LEAF BLIGHT (Helminthosporium maydis or Bipolarismaydis): A 1 to 9 visual rating indicating the resistance to SouthernLeaf Blight. A higher score indicates a higher resistance. Data arecollected only when sufficient selection pressure exists in theexperiment measured.

SOURST=SOUTHERN RUST (Puccinia polysora): A 1 to 9 visual ratingindicating the resistance to Southern Rust. A higher score indicates ahigher resistance. Data are collected only when sufficient selectionpressure exists in the experiment measured.

SPKDSC=SPIKLET DENSITY SCORE: The visual 1-9 rating of how densespikelets are on the middle tassel branches. A higher score indicateshigher spikelet density.

STAGRN=STAY GREEN: Stay green is the measure of plant health near thetime of black layer formation (physiological maturity). A high scoreindicates better late-season plant health.

STDADV=STALK STANDING ADVANTAGE: The advantage of variety #1 overvariety #2 for the trait STKCNT.

STKCNT=NUMBER OF PLANTS: This is the final stand or number of plants perplot.

STKLDG=STALK LODGING REGULAR: This is the percentage of plants that didnot stalk lodge (stalk breakage) at regular harvest (when grain moistureis between about 20 and 30%) as measured by either natural lodging orpushing the stalks and determining the percentage of plants that breakbelow the ear. Data are collected only when sufficient selectionpressure exists in the experiment measured.

STKLDS=STALK LODGING SCORE: A plant is considered as stalk lodged if thestalk is broken or crimped between the ear and the ground. This can becaused by any or a combination of the following: strong winds late inthe season, disease pressure within the stalks, ECB damage orgenetically weak stalks. This trait should be taken just prior to or atharvest. Expressed on a 1 to 9 scale with 9 being no lodging. Data arecollected only when sufficient selection pressure exists in theexperiment measured.

STLLPN=LATE STALK LODGING: This is the percent of plants that did notstalk lodge (stalk breakage or crimping) at or around late seasonharvest (when grain moisture is below 20%) as measured by either naturallodging or pushing the stalks and determining the percentage of plantsthat break or crimp below the ear. Data are collected only whensufficient selection pressure exists in the experiment measured.

STLPCN=STALK LODGING REGULAR: This is an estimate of the percentage ofplants that did not stalk lodge (stalk breakage) at regular harvest(when grain moisture is between about 20 and 30%) as measured by eithernatural lodging or pushing the stalks and determining the percentage ofplants that break below the ear. Data are collected only when sufficientselection pressure exists in the experiment measured.

STLTIP=STERILE TIPS SCORE: The visual 1 to 9 rating of the relative lackof glumes on the tassel central spike and branches. A higher scoreindicates less incidence of sterile tips or lack of glumes on thetassel.

STRT=GRAIN STARCH: Absolute value of starch content of the kernel aspredicted by Near-Infrared Transmittance and expressed as a percent ofdry matter.

STWWLT=Stewart's Wilt (Erwinia stewartii): A 1 to 9 visual ratingindicating the resistance to Stewart's Wilt. A higher score indicates ahigher resistance. Data are collected only when sufficient selectionpressure exists in the experiment measured.

SSRs: Genetic markers based on polymorphisms in repeated nucleotidesequences, such as microsatellites. A marker system based on SSRs can behighly informative in linkage analysis relative to other marker systemsin that multiple alleles may be present.

TASBLS=TASSEL BLAST: A 1 to 9 visual rating was used to measure thedegree of blasting (necrosis due to heat stress) of the tassel at thetime of flowering. A 1 would indicate a very high level of blasting attime of flowering, while a 9 would have no tassel blasting. Data arecollected only when sufficient selection pressure exists in theexperiment measured.

TASBRN=TASSEL BRANCH NUMBER: The number of tassel branches, with anthersoriginating from the central spike.

TASSZ=TASSEL SIZE: A 1 to 9 visual rating was used to indicate therelative size of the tassel. The higher the rating the larger thetassel.

TAS WT=TASSEL WEIGHT: This is the average weight of a tassel (grams)just prior to pollen shed.

TEXEAR=EAR TEXTURE: A 1 to 9 visual rating was used to indicate therelative hardness (smoothness of crown) of mature grain. A 1 would bevery soft (extreme dent) while a 9 would be very hard (flinty or verysmooth crown).

TILLER=TILLERS: A count of the number of tillers per plot that couldpossibly shed pollen was taken. Data are given as a percentage oftillers: number of tillers per plot divided by number of plants perplot. A tiller is defined as a secondary shoot that has developed as atassel capable of shedding pollen.

TSTWT=TEST WEIGHT (UNADJUSTED): The measure of the weight of the grainin pounds for a given volume (bushel).

TSWADV=TEST WEIGHT ADVANTAGE: The test weight advantage of variety #1over variety #2.

VARIETY: A maize line and minor genetic modifications thereof thatretain the overall genetics of the line including but not limited to alocus conversion, a mutation, or a somoclonal variant.

WIN M %=PERCENT MOISTURE WINS.

WIN Y %=PERCENT YIELD WINS.

YIELD BU/A=YIELD (BUSHELS/ACRE): Yield of the grain at harvest by weightor volume (bushels) per unit area (acre) adjusted to 15% moisture.

YLDADV=YIELD ADVANTAGE: The yield advantage of variety #1 over variety#2 as calculated by: YIELD of variety #1−YIELD variety #2=YIELDADVANTAGE of variety #1.

YLDSC=YIELD SCORE: A 1 to 9 visual rating was used to give a relativerating for yield based on plot ear piles. The higher the rating thegreater visual yield appearance.

DETAILED DESCRIPTION OF THE INVENTION AND FURTHER EMBODIMENTS

All tables discussed in the Detailed Description of the Invention andFurther Embodiments section can found at the end of the section.

Phenotypic Characteristics of PHWRZ

Inbred maize variety PHWRZ may be used as a male or female in theproduction of the first generation F1 hybrid and has a ComparativeRelative Maturity of 102.

The variety has shown uniformity and stability within the limits ofenvironmental influence for all the traits as described in the VarietyDescription Information (Table 1, found at the end of the section). Thevariety has been self-pollinated and ear-rowed a sufficient number ofgenerations with careful attention paid to uniformity of plant type toensure the homozygosity and phenotypic stability necessary for use incommercial hybrid seed production. The variety has been increased bothby hand and in isolated fields with continued observation foruniformity. No variant traits have been observed or are expected inPHWRZ.

Maize variety PHWRZ, being substantially homozygous, can be reproducedby planting seeds of the variety, growing the resulting maize plantsunder self-pollinating or sib-pollinating conditions with adequateisolation, and harvesting the resulting seed using techniques familiarto the agricultural arts.

Genotypic Characteristics of PHWRZ

In addition to phenotypic observations, a plant can also be identifiedby its genotype. The genotype of a plant can be characterized through agenetic marker profile.

As a result of inbreeding, PHWRZ is substantially homozygous. Thishomozygosity can be characterized at the loci shown in a marker profile.An F1 hybrid made with PHWRZ would substantially comprise the markerprofile of PHWRZ. This is because an F1 hybrid is the sum of its inbredparents, e.g., if one inbred parent is homozygous for allele x at aparticular locus, and the other inbred parent is homozygous for allele yat that locus, the F1 hybrid will be x.y (heterozygous) at that locus. Agenetic marker profile can therefore be used to identify hybridscomprising PHWRZ as a parent, since such hybrids will comprise two setsof alleles, one set of which will be from PHWRZ. The determination ofthe male set of alleles and the female set of alleles may be made byprofiling the hybrid and the pericarp of the hybrid seed, which iscomposed of maternal parent cells. One way to obtain the paternal parentprofile is to subtract the pericarp profile from the hybrid profile.

Subsequent generations of progeny produced by selection and breeding areexpected to be of genotype xx (homozygous), yy (homozygous), or xy(heterozygous) for these locus positions. When the F1 plant is used toproduce an inbred, the resulting inbred should be either x or y for thatallele.

Therefore, in accordance with the above, an embodiment of this inventionis a PHWRZ progeny maize plant or plant part that is a first generation(F1) hybrid maize plant comprising two sets of alleles, wherein one setof the alleles is the same as PHWRZ at substantially all loci. A maizecell wherein one set of the alleles is the same as PHWRZ atsubstantially all loci is also an embodiment of the invention. Thismaize cell may be a part of a hybrid seed, plant or plant part producedby crossing PHWRZ with another maize plant.

Genetic marker profiles can be obtained by techniques such asRestriction Fragment Length Polymorphisms (RFLPs), Randomly AmplifiedPolymorphic DNAs (RAPDs), Arbitrarily Primed Polymerase Chain Reaction(AP-PCR), DNA Amplification Fingerprinting (DAF), Sequence CharacterizedAmplified Regions (SCARs), Amplified Fragment Length Polymorphisms(AFLPs), Simple Sequence Repeats (SSRs) which are also referred to asMicrosatellites, and Single Nucleotide Polymorphisms (SNPs). Forexample, see Berry, Don et al., “Assessing Probability of Ancestry UsingSimple Sequence Repeat Profiles: Applications to Maize Hybrids andInbreds”, Genetics, 2002, 161:813-824, and Berry, Don et al., “AssessingProbability of Ancestry Using Simple Sequence Repeat Profiles:Applications to Maize Inbred Lines and Soybean Varieties”, Genetics,2003, 165: 331-342.

Particular markers used for these purposes are not limited to the set ofmarkers disclosed herein, but may include any type of marker and markerprofile which provides a means of distinguishing varieties. In additionto being used for identification of maize variety PHWRZ, a hybridproduced through the use of PHWRZ, and the identification orverification of pedigree for progeny plants produced through the use ofPHWRZ, a genetic marker profile is also useful in developing a locusconversion of PHWRZ.

Means of performing genetic marker profiles using SSR polymorphisms arewell known in the art. SSRs are genetic markers based on polymorphismsin repeated nucleotide sequences, such as microsatellites. A markersystem based on SSRs can be highly informative in linkage analysisrelative to other marker systems in that multiple alleles may bepresent. Another advantage of this type of marker is that, through useof flanking primers, detection of SSRs can be achieved, for example, bythe polymerase chain reaction (PCR), thereby eliminating the need forlabor-intensive Southern hybridization. The PCR detection is done by useof two oligonucleotide primers flanking the polymorphic segment ofrepetitive DNA. Repeated cycles of heat denaturation of the DNA followedby annealing of the primers to their complementary sequences at lowtemperatures, and extension of the annealed primers with DNA polymerase,comprise the major part of the methodology.

Following amplification, markers can be scored by electrophoresis of theamplification products. Scoring of marker genotype is based on the sizeof the amplified fragment, which may be measured by the number of basepairs of the fragment. While variation in the primer used or inlaboratory procedures can affect the reported fragment size, relativevalues should remain constant regardless of the specific primer orlaboratory used. When comparing plants it is preferable if all SSRprofiles are performed in the same lab. An SSR service is available tothe public on a contractual basis by DNA Landmarks inSaint-Jean-sur-Richelieu, Quebec, Canada.

Primers used to perform SSRs are publicly available and may be found inthe Maize GDB on the World Wide Web at maizegdb.org (sponsored by theUSDA Agricultural Research Service), in Sharopova et al. (Plant Mol.Biol. 48(5-6):463-481), Lee et al. (Plant Mol. Biol. 48(5-6); 453-461).Primers may be constructed from publicly available sequence information.Some marker information may also be available from DNA Landmarks.

PHWRZ and its plant parts can be identified through a molecular markerprofile. Such plant parts may be either diploid or haploid. Alsoencompassed within the scope of the invention are plants and plant partssubstantially benefiting from the use of PHWRZ in their development,such as PHWRZ comprising a locus conversion.

Comparing PHWRZ to Other Inbreds

A breeder uses various methods to help determine which plants should beselected from segregating populations and ultimately which inbredvarieties will be used to develop hybrids for commercialization. Inaddition to knowledge of the germplasm and plant genetics, a part of theselection process is dependent on experimental design coupled with theuse of statistical analysis. Experimental design and statisticalanalysis are used to help determine which plants, which family ofplants, and finally which inbred varieties and hybrid combinations aresignificantly better or different for one or more traits of interest.Experimental design methods are used to assess error so that differencesbetween two inbred varieties or two hybrid varieties can be moreaccurately evaluated. Statistical analysis includes the calculation ofmean values, determination of the statistical significance of thesources of variation, and the calculation of the appropriate variancecomponents. Either a five or a one percent significance level iscustomarily used to determine whether a difference that occurs for agiven trait is real or due to the environment or experimental error. Oneof ordinary skill in the art of plant breeding would know how toevaluate the traits of two plant varieties to determine if there is asignificant difference between the two traits expressed by thosevarieties. For example, see Fehr, Walt, Principles of CultivarDevelopment, p. 261-286 (1987). Mean trait values may be used todetermine whether trait differences are significant. Trait values shouldpreferably be measured on plants grown under the same environmentalconditions, and environmental conditions should be appropriate for thetraits or traits being evaluated. Sufficient selection pressure shouldbe present for optimum measurement of traits of interest such asherbicide, insect or disease resistance. A locus conversion of PHWRZ forherbicide resistance should be compared with an isogenic counterpart inthe absence of the converted trait. In addition, a locus conversion forinsect or disease resistance should be compared to the isogeniccounterpart, in the absence of disease pressure or insect pressure.

In Table 2 (Table 2, found at the end of the specification), data fromtraits and characteristics of maize variety PHWRZ per se are given andcompared to other maize varieties. The results in Table 2 show maizevariety PHWRZ has significantly different traits compared to other maizevarieties (Mean1=Mean of Variety 1, Mean2=Mean of Variety 2, Locs=thenumber of locations used for statistics reported in the table, Reps=thenumber of replications used for statistics reported in the table,Diff=difference between the means, Prob=probability of significantdifference between means, in general one may use probability of lessthan or equal to 0.10 or less than or equal to 0.05 to determine astatistical significant difference between means).

Development of Maize Hybrids Using PHWRZ

A single cross maize hybrid results from the cross of two inbredvarieties, each of which has a genotype that complements the genotype ofthe other. A hybrid progeny of the first generation is designated F1. Inthe development of commercial hybrids in a maize plant breeding program,only the F1 hybrid plants are sought. F1 hybrids are more vigorous thantheir inbred parents. This hybrid vigor, or heterosis, can be manifestedin many polygenic traits, including increased vegetative growth andincreased yield.

PHWRZ may be used to produce hybrid maize. One such embodiment is themethod of crossing maize variety PHWRZ with another maize plant, such asa different maize variety, to form a first generation F1 hybrid seed.The first generation F1 hybrid seed, plant and plant part produced bythis method is an embodiment of the invention. The first generation F1seed, plant and plant part will comprise an essentially complete set ofthe alleles of variety PHWRZ. One of ordinary skill in the art canutilize molecular methods to identify a particular F1 hybrid plantproduced using variety PHWRZ. Further, one of ordinary skill in the artmay also produce F1 hybrids with transgenic, male sterile and/or locusconversions of variety PHWRZ.

The development of a maize hybrid in a maize plant breeding programinvolves three steps: (1) the selection of plants from various germplasmpools for initial breeding crosses; (2) the selfing of the selectedplants from the breeding crosses for several generations to produce aseries of varieties, such as PHWRZ, which, although different from eachother, breed true and are highly uniform; and (3) crossing the selectedvarieties with different varieties to produce the hybrids. During theinbreeding process in maize, the vigor of the varieties decreases, andso one would not be likely to use PHWRZ directly to produce grain.However, vigor is restored when PHWRZ is crossed to a different inbredvariety to produce a commercial F1 hybrid. An important consequence ofthe homozygosity and homogeneity of the inbred variety is that thehybrid between a defined pair of inbreds may be reproduced indefinitelyas long as the homogeneity of the inbred parents is maintained.

PHWRZ may be used to produce a single cross hybrid, a double crosshybrid, or a three-way hybrid. A single cross hybrid is produced whentwo inbred varieties are crossed to produce the F1 progeny. A doublecross hybrid is produced from four inbred varieties crossed in pairs(A×B and C×D) and then the two F1 hybrids are crossed again (A×B)×(C×D).A three-way cross hybrid is produced from three inbred varieties wheretwo of the inbred varieties are crossed (A×B) and then the resulting F1hybrid is crossed with the third inbred (A×B)×C. In each case, pericarptissue from the female parent will be a part of and protect the hybridseed.

Combining Ability of PHWRZ

Combining ability of a variety, as well as the performance of thevariety per se, is a factor in the selection of improved maize inbreds.Combining ability refers to a variety's contribution as a parent whencrossed with other varieties to form hybrids. The hybrids formed for thepurpose of selecting superior varieties may be referred to as testcrosses, and include comparisons to other hybrid varieties grown in thesame environment (same cross, location and time of planting). One way ofmeasuring combining ability is by using values based in part on theoverall mean of a number of test crosses weighted by number ofexperiment and location combinations in which the hybrid combinationsoccurs. The mean may be adjusted to remove environmental effects andknown genetic relationships among the varieties.

General combining ability provides an overall score for the inbred overa large number of test crosses. Specific combining ability providesinformation on hybrid combinations formed by PHWRZ and a specific inbredparent. A variety such as PHWRZ which exhibits good general combiningability may be used in a large number of hybrid combinations.

A general combining ability report for PHWRZ is provided in Table 3.This data represents the overall mean value for these traits overhundreds of test crosses. Table 3 demonstrates that PHWRZ shows goodgeneral combining ability for hybrid production.

Hybrid Comparisons

These hybrid comparisons represent specific hybrid crosses with PHWRZand a comparison of these specific hybrids with other hybrids withfavorable characteristics. These comparisons illustrate the goodspecific combining ability of PHWRZ.

The results in Table 4 compare a specific hybrid for which PHWRZ is aparent with other hybrids. The results show that PHWRZ shows goodspecific combining ability.

The data in Table 5 show that numerous species of the genus of F1hybrids created with PHWRZ have been reduced to practice. Phenotypicdata are presented for these hybrids and are based on replicated fieldtrials. Of course, many more species of this genus may be created by oneof ordinary skill in the art without undue experimentation by crossingPHWRZ with a multitude of publicly available inbred varieties. Forexample, see J. T. Gerdes et al., Compilation of North American MaizeBreeding Germplasm, pp. 1-87 (Crop Science Society of America, 1993)which is incorporated by reference for this purpose.

Locus Conversions of PHWRZ

PHWRZ represents a new base genetic variety into which a new locus maybe introgressed. Direct transformation and backcrossing represent twoimportant methods that can be used to accomplish such an introgression.The term locus conversion is used to designate the product of such anintrogression.

A locus conversion of PHWRZ will retain the genetic integrity of PHWRZ.A locus conversion of PHWRZ will comprise at least 90%, 92%, 93%, 94%,95%, 96%, 97%, 98% or 99% of the genetic identity of PHWRZ. For example,a locus conversion of PHWRZ can be developed when DNA sequences areintroduced through backcrossing (Hallauer et al. in Corn and CornImprovement, Sprague and Dudley, Third Ed. 1998), with PHWRZ utilized asthe recurrent parent. Both naturally occurring and transgenic DNAsequences may be introduced through backcrossing techniques. A backcrossconversion may produce a plant with a trait or locus conversion in atleast one or more backcrosses, including at least 2 crosses, at least 3crosses, at least 4 crosses, at least 5 crosses and the like. Molecularmarker assisted breeding or selection may be utilized to reduce thenumber of backcrosses necessary to achieve the backcross conversion. Forexample, see Openshaw, S. J. et al., Marker-assisted Selection inBackcross Breeding, In: Proceedings Symposium of the Analysis ofMolecular Data, August 1994, Crop Science Society of America, Corvallis,O R, where it is demonstrated that a locus conversion can be made in asfew as two backcrosses.

The complexity of the backcross conversion method depends on the type oftrait being transferred (single genes or closely linked genes as vs.unlinked genes), the level of expression of the trait, the type ofinheritance (cytoplasmic or nuclear) and the types of parents includedin the cross. It is understood by those of ordinary skill in the artthat for single locus traits that are relatively easy to classify, thebackcross method is effective and relatively easy to manage. (SeeHallauer et al. in Corn and Corn Improvement, Sprague and Dudley, ThirdEd. 1998). Desired traits that may be transferred through locusconversion include, but are not limited to, waxy starch, sterility(nuclear and cytoplasmic), fertility restoration, grain color (white),nutritional enhancements, drought resistance, enhanced nitrogenutilization efficiency, altered nitrogen responsiveness, altered fattyacid profile, increased digestibility, low phytate, industrialenhancements, disease resistance (bacterial, fungal or viral), insectresistance, herbicide resistance and yield enhancements. In addition, anintrogression site itself, such as an FRT site, Lox site or other sitespecific integration site, may be inserted by backcrossing and utilizedfor direct insertion of one or more genes of interest into a specificplant variety. The seed industry commonly markets “triple stacks” ofbase genetics; which can be varieties comprising a locus conversion ofat least 3 loci. Similarly, “quadruple stacks” would comprise the basegenetics and could comprise a locus conversion of at least 4 loci. Asingle locus may contain several transgenes, such as a transgene fordisease resistance that, in the same expression vector, also contains atransgene for herbicide resistance. As used herein, the phrase‘comprising a’ transgene, transgenic event or locus conversion means oneor more transgenes, transgenic events or locus conversions. The gene forherbicide resistance may be used as a selectable marker and/or as aphenotypic trait. A locus conversion of a site specific integrationsystem allows for the integration of multiple genes at the convertedloci. Further, SSI and FRT technologies known to those of skill in theart in the art may result in multiple gene introgressions at a singlelocus.

The locus conversion may result from either the transfer of a dominantallele or a recessive allele. Selection of progeny containing the traitof interest is accomplished by direct selection for a trait associatedwith a dominant allele. Transgenes transferred via backcrossingtypically function as a dominant single gene trait and are relativelyeasy to classify. Selection of progeny for a trait that is transferredvia a recessive allele, such as the waxy starch characteristic, requiresgrowing and selfing the first backcross generation to determine whichplants carry the recessive alleles. Recessive traits may requireadditional progeny testing in successive backcross generations todetermine the presence of the locus of interest. The last backcrossgeneration is usually selfed to give pure breeding progeny for thegene(s) being transferred, although a backcross conversion with a stablyintrogressed trait may also be maintained by further backcrossing to therecurrent parent with selection for the converted trait.

Along with selection for the trait of interest, progeny are selected forthe phenotype and/or genotype of the recurrent parent. Whileoccasionally additional polynucleotide sequences or genes may betransferred along with the backcross conversion, the backcrossconversion variety “fits into the same hybrid combination as therecurrent parent inbred variety and contributes the effect of theadditional locus added through the backcross.” Poehlman et al. (1995,page 334).

One process for adding or modifying a trait or locus in maize varietyPHWRZ comprises crossing PHWRZ plants grown from PHWRZ seed with plantsof another maize variety that comprise the desired trait or locus,selecting F1 progeny plants that comprise the desired trait or locus toproduce selected F1 progeny plants, crossing the selected progeny plantswith the PHWRZ plants to produce backcross progeny plants, selecting forbackcross progeny plants that have the desired trait or locus and thephenotypic characteristics of maize variety PHWRZ to produce selectedbackcross progeny plants; and backcrossing to PHWRZ one or more times insuccession to produce backcross progeny plants that comprise said traitor locus. The modified PHWRZ may be further characterized as havingessentially the same phenotypic characteristics of maize variety PHWRZlisted in Table 1 and/or may be characterized by percent identity toPHWRZ as determined by molecular markers, such as SSR markers or SNPs.

In addition, the above process and other similar processes describedherein may be used to produce F1 hybrid maize seed by adding a step atthe end of the process that comprises crossing PHWRZ with the locusconversion with a different maize plant and harvesting the resultant F1hybrid maize seed.

Traits are also used by those of ordinary skill in the art tocharacterize progeny. Traits are commonly evaluated at a significancelevel, such as a 1%, 5% or 10% significance level, when measured inplants grown in the same environmental conditions.

Male Sterility and Hybrid Seed Production

Hybrid seed production requires elimination or inactivation of pollenproduced by the female inbred parent. Incomplete removal or inactivationof the pollen provides the potential for self-pollination. A reliablemethod of controlling male fertility in plants offers the opportunityfor improved seed production.

PHWRZ can be produced in a male-sterile form. There are several ways inwhich a maize plant can be manipulated so that it is male sterile. Theseinclude use of manual or mechanical emasculation (or detasseling), useof one or more genetic factors that confer male sterility, includingcytoplasmic genetic and/or nuclear genetic male sterility, use ofgametocides and the like. A male sterile designated PHWRZ may includeone or more genetic factors, which result in cytoplasmic genetic and/ornuclear genetic male sterility. All of such embodiments are within thescope of the present claims. The male sterility may be either partial orcomplete male sterility.

Hybrid maize seed is often produced by a male sterility systemincorporating manual or mechanical detasseling. Alternate strips of twomaize inbreds are planted in a field, and the pollen-bearing tassels areremoved from one of the inbreds (female). Provided that there issufficient isolation from sources of foreign maize pollen, the ears ofthe detasseled inbred will be fertilized only from the other inbred(male), and the resulting seed is therefore hybrid and will form hybridplants.

The laborious detasseling process can be avoided by using cytoplasmicmale-sterile (CMS) inbreds. Plants of a CMS inbred are male sterile as aresult of genetic factors in the cytoplasm, as opposed to the nucleus,and so nuclear linked genes are not transferred during backcrossing.Thus, this characteristic is inherited exclusively through the femaleparent in maize plants, since only the female provides cytoplasm to thefertilized seed. CMS plants are fertilized with pollen from anotherinbred that is not male-sterile. Pollen from the second inbred may ormay not contribute genes that make the hybrid plants male-fertile, andeither option may be preferred depending on the intended use of thehybrid. The same hybrid seed, a portion produced from detasseled fertilemaize and a portion produced using the CMS system, can be blended toinsure that adequate pollen loads are available for fertilization whenthe hybrid plants are grown. CMS systems have been successfully usedsince the 1950's, and the male sterility trait is routinely backcrossedinto inbred varieties. See Wych, p. 585-586, 1998.

There are several methods of conferring genetic male sterilityavailable, such as multiple mutant genes at separate locations withinthe genome that confer male sterility, as disclosed in U.S. Pat. Nos.4,654,465 and 4,727,219 to Brar et al. and chromosomal translocations asdescribed by Patterson in U.S. Pat. Nos. 3,861,709 and 3,710,511. Inaddition to these methods, Albertsen et al., U.S. Pat. No. 5,432,068,describe a system of nuclear male sterility which includes: identifyinga gene which is critical to male fertility; silencing this native genewhich is critical to male fertility; removing the native promoter fromthe essential male fertility gene and replacing it with an induciblepromoter; inserting this genetically engineered gene back into theplant; and thus creating a plant that is male sterile because theinducible promoter is not “on” resulting in the male fertility gene notbeing transcribed. Fertility is restored by inducing, or turning “on”,the promoter, which in turn allows the gene that confers male fertilityto be transcribed.

These, and the other methods of conferring genetic male sterility in theart, each possess their own benefits and drawbacks. Some other methodsuse a variety of approaches such as delivering into the plant a geneencoding a cytotoxic substance associated with a male tissue specificpromoter or an antisense system in which a gene critical to fertility isidentified and an antisense to that gene is inserted in the plant (seeFabinjanski, et al. EPO 89/3010153.8 publication no. 329,308 and PCTapplication PCT/CA90/00037 published as WO 90/08828).

Another system for controlling male sterility makes use of gametocides.Gametocides are not a genetic system, but rather a topical applicationof chemicals. These chemicals affect cells that are critical to malefertility. The application of these chemicals affects fertility in theplants only for the growing season in which the gametocide is applied(see Carlson, Glenn R., and U.S. Pat. No. 4,936,904). Application of thegametocide, timing of the application and genotype specificity oftenlimit the usefulness of the approach and it is not appropriate in allsituations.

Incomplete control over male fertility may result in self-pollinatedseed being unintentionally harvested and packaged with hybrid seed. Thiswould typically be only female parent seed, because the male plant isgrown in rows that are typically destroyed prior to seed development.Once the seed from the hybrid bag is planted, it is possible to identifyand select these self-pollinated plants. These self-pollinated plantswill be one of the inbred varieties used to produce the hybrid. Thoughthe possibility of PHWRZ being included in a hybrid seed bag exists, theoccurrence is very low because much care is taken by seed companies toavoid such inclusions. It is worth noting that hybrid seed is sold togrowers for the production of grain or forage and not for breeding orseed production. These self-pollinated plants can be identified andselected by one skilled in the art due to their less vigorous appearancefor vegetative and/or reproductive characteristics, including shorterplant height, small ear size, ear and kernel shape, or othercharacteristics.

Identification of these self-pollinated varieties can also beaccomplished through molecular marker analyses. See, “The Identificationof Female Selfs in Hybrid Maize: A Comparison Using Electrophoresis andMorphology”, Smith, J. S. C. and Wych, R. D., Seed Science andTechnology 14, 1-8 (1995), the disclosure of which is expresslyincorporated herein by reference. Through these technologies, thehomozygosity of the self pollinated variety can be verified by analyzingallelic composition at various loci along the genome. Those methodsallow for rapid identification of the invention disclosed herein. Seealso, “Identification of Atypical Plants in Hybrid Maize Seed byPostcontrol and Electrophoresis” Sarca, V. et al., Probleme de GeneticaTeoritica si Aplicata Vol. 20 (1) p. 29-42.

Transformation

The advent of new molecular biological techniques has allowed theisolation and characterization of genetic elements with specificfunctions, such as encoding specific protein products. Scientists in thefield of plant biology developed a strong interest in engineering thegenome of plants to contain and express foreign genetic elements, oradditional, or modified versions of native or endogenous geneticelements in order to alter the traits of a plant in a specific manner.Any DNA sequences, whether from a different species or from the samespecies, which are stably inserted into the cell using transformationare referred to herein collectively as “transgenes” and/or “transgenicevents”. In some embodiments of the invention, a transformed variant ofPHWRZ may comprise at least one transgene but could contain at least 1,2, 3, 4, 5, 6, 7, 8, 9, 10 and/or no more than 15, 14, 13, 12, 11, 10,9, 8, 7, 6, 5, 4, 3, or 2. Over the last fifteen to twenty years severalmethods for producing transgenic plants have been developed, and thepresent invention also relates to transformed versions of the claimedmaize variety PHWRZ as well as hybrid combinations thereof.

Numerous methods for plant transformation have been developed, includingbiological and physical plant transformation protocols. See, forexample, Miki et al., “Procedures for Introducing Foreign DNA intoPlants” in Methods in Plant Molecular Biology and Biotechnology, Glick,B. R. and Thompson, J. E. Eds. (CRC Press, Inc., Boca Raton, 1993) pages67-88 and Armstrong, “The First Decade of Maize Transformation: A Reviewand Future Perspective” (Maydica 44:101-109, 1999). In addition,expression vectors and in vitro culture methods for plant cell or tissuetransformation and regeneration of plants are available. See, forexample, Gruber et al., “Vectors for Plant Transformation” in Methods inPlant Molecular Biology and Biotechnology, Glick, B. R. and Thompson, J.E. Eds. (CRC Press, Inc., Boca Raton, 1993) pages 89-119.

The most prevalent types of plant transformation involve theconstruction of an expression vector. Such a vector comprises a DNAsequence that contains a gene under the control of or operatively linkedto a regulatory element, for example a promoter. The vector may containone or more genes and one or more regulatory elements.

A transgenic event which has been stably engineered into the germ cellline of a particular maize plant using transformation techniques, couldbe moved into the germ cell line of another variety using traditionalbreeding techniques that are well known in the plant breeding arts. Forexample, a backcrossing approach is commonly used to move a transgenicevent from a transformed maize plant to another variety, and theresulting progeny would then comprise the transgenic event(s). Also, ifan inbred variety was used for the transformation then the transgenicplants could be crossed to a different inbred in order to produce atransgenic hybrid maize plant.

Various genetic elements can be introduced into the plant genome usingtransformation. These elements include, but are not limited to genes;coding sequences; inducible, constitutive, and tissue specificpromoters; enhancing sequences; and signal and targeting sequences. Forexample, see the traits, genes and transformation methods listed in U.S.Pat. Nos. 6,118,055 and 6,284,953, which are herein incorporated byreference. In addition, transformability of a variety can be increasedby introgressing the trait of high transformability from another varietyknown to have high transformability, such as Hi-II. See U.S. PatentApplication Publication US2004/0016030 (2004).

With transgenic plants according to the present invention, a foreignprotein can be produced in commercial quantities. Thus, techniques forthe selection and propagation of transformed plants, which are wellunderstood in the art, yield a plurality of transgenic plants that areharvested in a conventional manner, and a foreign protein then can beextracted from a tissue of interest or from total biomass. Proteinextraction from plant biomass can be accomplished by known methods whichare discussed, for example, by Heney and Orr, Anal. Biochem. 114: 92-6(1981).

Transgenic events can be mapped by one of ordinary skill in the art andsuch techniques are well known to those of ordinary skill in the art.For exemplary methodologies in this regard, see for example, Glick andThompson, Methods in Plant Molecular Biology and Biotechnology 269-284(CRC Press, Boca Raton, 1993).

Likewise, by means of the present invention, plants can be geneticallyengineered to express various phenotypes of agronomic interest. Throughthe transformation of maize the expression of genes can be altered toenhance disease resistance, insect resistance, herbicide resistance,agronomic traits, grain quality and other traits. Transformation canalso be used to insert DNA sequences which control or help controlmale-sterility. DNA sequences native to maize as well as non-native DNAsequences can be transformed into maize and used to alter levels ofnative or non-native proteins. Various promoters, targeting sequences,enhancing sequences, and other DNA sequences can be inserted into themaize genome for the purpose of altering the expression of proteins.Reduction of the activity of specific genes (also known as genesilencing, or gene suppression) is desirable for several aspects ofgenetic engineering in plants.

Many techniques for gene silencing are well known to one of skill in theart, including but not limited to knock-outs (such as by insertion of atransposable element such as mu (Vicki Chandler, The Maize Handbook ch.118 (Springer-Verlag 1994) or other genetic elements such as a FRT, Loxor other site specific integration site, antisense technology (see,e.g., Sheehy et al. (1988) PNAS USA 85:8805-8809; and U.S. Pat. Nos.5,107,065; 5,453,566; and 5,759,829); co-suppression (e.g., Taylor(1997) Plant Cell 9:1245; Jorgensen (1990) Trends Biotech.8(12):340-344; Flavell (1994) PNAS USA 91:3490-3496; Finnegan et al.(1994) Bio/Technology 12: 883-888; and Neuhuber et al. (1994) Mol. Gen.Genet. 244:230-241); RNA interference (Napoli et al. (1990) Plant Cell2:279-289; U.S. Pat. No. 5,034,323; Sharp (1999) Genes Dev. 13:139-141;Zamore et al. (2000) Cell 101:25-33; and Montgomery et al. (1998) PNASUSA 95:15502-15507), virus-induced gene silencing (Burton, et al. (2000)Plant Cell 12:691-705; and Baulcombe (1999) Curr. Op. Plant Bio.2:109-113); target-RNA-specific ribozymes (Haseloff et al. (1988) Nature334: 585-591); hairpin structures (Smith et al. (2000) Nature407:319-320; WO 99/53050; and WO 98/53083); MicroRNA (Aukerman & Sakai(2003) Plant Cell 15:2730-2741); ribozymes (Steinecke et al. (1992) EMBOJ. 11:1525; and Perriman et al. (1993) Antisense Res. Dev. 3:253);oligonucleotide mediated targeted modification (e.g., WO 03/076574 andWO 99/25853); Zn-finger targeted molecules (e.g., WO 01/52620; WO03/048345; and WO 00/42219); and other methods or combinations of theabove methods known to those of skill in the art.

Exemplary nucleotide sequences that may be altered by geneticengineering include, but are not limited to, those categorized below.

1. Transgenes That Confer Resistance To Insects or Disease And ThatEncode:

(A) Plant disease resistance genes. Plant defenses are often activatedby specific interaction between the product of a disease resistance gene(R) in the plant and the product of a corresponding avirulence (Avr)gene in the pathogen. A plant variety can be transformed with clonedresistance gene to engineer plants that are resistant to specificpathogen strains. See, for example Jones et al., Science 266: 789 (1994)(cloning of the tomato Cf-9 gene for resistance to Cladosporium fulvum);Martin et al., Science 262: 1432 (1993) (tomato Pto gene for resistanceto Pseudomonas syringae pv. tomato encodes a protein kinase); Mindrinoset al., Cell 78: 1089 (1994) (Arabidopsis RSP2 gene for resistance toPseudomonas syringae), McDowell & Woffenden, (2003) Trends Biotechnol.21(4): 178-83 and Toyoda et al., (2002) Transgenic Res. 11(6):567-82. Aplant resistant to a disease is one that is more resistant to a pathogenas compared to the wild type plant.

(B) A Bacillus thuringiensis protein, a derivative thereof or asynthetic polypeptide modeled thereon. See, for example, Geiser et al.,Gene 48: 109 (1986), who disclose the cloning and nucleotide sequence ofa Bt delta-endotoxin gene. Moreover, DNA molecules encodingdelta-endotoxin genes can be purchased from American Type CultureCollection (Rockville, Md.), for example, under ATCC Accession Nos.40098, 67136, 31995 and 31998. Other non-limiting examples of Bacillusthuringiensis transgenes being genetically engineered are given in thefollowing patents and patent applications and hereby are incorporated byreference for this purpose: U.S. Pat. Nos. 5,188,960; 5,689,052;5,880,275; 5,986,177; 7,105,332; 7,208,474; WO 91/14778; WO 99/31248; WO01/12731; WO 99/24581; WO 97/40162 and U.S. application Ser. Nos.10/032,717; 10/414,637; 11/018,615; 11/404,297; 11/404,638; 11/471,878;11/780,501; 11/780,511; 11/780,503; 11/953,648; 11/953,648; and11/957,893.

(C) An insect-specific hormone or pheromone such as an ecdysteroid andjuvenile hormone, a variant thereof, a mimetic based thereon, or anantagonist or agonist thereof. See, for example, the disclosure byHammock et al., Nature 344: 458 (1990), of baculovirus expression ofcloned juvenile hormone esterase, an inactivator of juvenile hormone.

(D) An insect-specific peptide which, upon expression, disrupts thephysiology of the affected pest. For example, see the disclosures ofRegan, J. Biol. Chem. 269: 9 (1994) (expression cloning yields DNAcoding for insect diuretic hormone receptor); Pratt et al., Biochem.Biophys. Res. Comm. 163: 1243 (1989) (an allostatin is identified inDiploptera puntata); Chattopadhyay et al. (2004) Critical Reviews inMicrobiology 30 (1): 33-54 2004; Zjawiony (2004) J Nat Prod 67 (2):300-310; Carlini & Grossi-de-Sa (2002) Toxicon, 40 (11): 1515-1539;Ussuf et al. (2001) Curr Sci. 80 (7): 847-853; and Vasconcelos &Oliveira (2004) Toxicon 44 (4): 385-403. See also U.S. Pat. No.5,266,317 to Tomalski et al., who disclose genes encodinginsect-specific toxins.

(E) An enzyme responsible for a hyperaccumulation of a monterpene, asesquiterpene, a steroid, hydroxamic acid, a phenylpropanoid derivativeor another non-protein molecule with insecticidal activity.

(F) An enzyme involved in the modification, including thepost-translational modification, of a biologically active molecule; forexample, a glycolytic enzyme, a proteolytic enzyme, a lipolytic enzyme,a nuclease, a cyclase, a transaminase, an esterase, a hydrolase, aphosphatase, a kinase, a phosphorylase, a polymerase, an elastase, achitinase and a glucanase, whether natural or synthetic. See PCTapplication WO 93/02197 in the name of Scott et al., which discloses thenucleotide sequence of a callase gene. DNA molecules which containchitinase-encoding sequences can be obtained, for example, from the ATCCunder Accession Nos. 39637 and 67152. See also Kramer et al., InsectBiochem. Molec. Biol. 23: 691 (1993), who teach the nucleotide sequenceof a cDNA encoding tobacco hookworm chitinase, and Kawalleck et al.,Plant Molec. Biol. 21: 673 (1993), who provide the nucleotide sequenceof the parsley ubi4-2 polyubiquitin gene, and U.S. Pat. Nos. 6,563,020;7,145,060 and 7,087,810.

(G) A molecule that stimulates signal transduction. For example, see thedisclosure by Botella et al., Plant Molec. Biol. 24: 757 (1994), ofnucleotide sequences for mung bean calmodulin cDNA clones, and Griess etal., Plant Physiol. 104: 1467 (1994), who provide the nucleotidesequence of a maize calmodulin cDNA clone.

(H) A hydrophobic moment peptide. See PCT application WO 95/16776 andU.S. Pat. No. 5,580,852 disclosure of peptide derivatives of Tachyplesinwhich inhibit fungal plant pathogens) and PCT application WO 95/18855and U.S. Pat. No. 5,607,914 (teaches synthetic antimicrobial peptidesthat confer disease resistance).

(I) A membrane permease, a channel former or a channel blocker. Forexample, see the disclosure by Jaynes et al., Plant Sci. 89: 43 (1993),of heterologous expression of a cecropin-beta lytic peptide analog torender transgenic tobacco plants resistant to Pseudomonas solanacearum.

(J) A viral-invasive protein or a complex toxin derived therefrom. Forexample, the accumulation of viral coat proteins in transformed plantcells imparts resistance to viral infection and/or disease developmenteffected by the virus from which the coat protein gene is derived, aswell as by related viruses. See Beachy et al., Ann. Rev. Phytopathol.28: 451 (1990). Coat protein-mediated resistance has been conferred upontransformed plants against alfalfa mosaic virus, cucumber mosaic virus,tobacco streak virus, potato virus X, potato virus Y, tobacco etchvirus, tobacco rattle virus and tobacco mosaic virus. Id.

(K) An insect-specific antibody or an immunotoxin derived therefrom.Thus, an antibody targeted to a critical metabolic function in theinsect gut would inactivate an affected enzyme, killing the insect. Cf.Taylor et al., Abstract #497, SEVENTH INT'L SYMPOSIUM ON MOLECULARPLANT-MICROBE INTERACTIONS (Edinburgh, Scotland, 1994) (enzymaticinactivation in transgenic tobacco via production of single-chainantibody fragments).

(L) A virus-specific antibody. See, for example, Tavladoraki et al.,Nature 366: 469 (1993), who show that transgenic plants expressingrecombinant antibody genes are protected from virus attack.

(M) A developmental-arrestive protein produced in nature by a pathogenor a parasite. Thus, fungal endo alpha-1,4-D-polygalacturonasesfacilitate fungal colonization and plant nutrient release bysolubilizing plant cell wall homo-alpha-1,4-D-galacturonase. See Lamb etal., Bio/Technology 10: 1436 (1992). The cloning and characterization ofa gene which encodes a bean endopolygalacturonase-inhibiting protein isdescribed by Toubart et al., Plant J. 2: 367 (1992).

(N) A developmental-arrestive protein produced in nature by a plant. Forexample, Logemann et al., Bio/Technology 10: 305 (1992), have shown thattransgenic plants expressing the barley ribosome-inactivating gene havean increased resistance to fungal disease.

(O) Genes involved in the Systemic Acquired Resistance (SAR) Responseand/or the pathogenesis related genes. Briggs, S., Current Biology, 5(2)(1995), Pieterse & Van Loon (2004) Curr. Opin. Plant Bio. 7(4):456-64and Somssich (2003) Cell 113(7):815-6.

(P) Antifungal genes (Cornelissen and Melchers, Pl. Physiol.101:709-712, (1993) and Parijs et al., Planta 183:258-264, (1991) andBushnell et al., Can. J. of Plant Path. 20(2):137-149 (1998). Also seeU.S. application Ser. Nos. 09/950,933; 11/619,645; 11/657,710;11/748,994; 11/774,121 and U.S. Pat. Nos. 6,891,085 and 7,306,946.

(Q) Detoxification genes, such as for fumonisin, beauvericin,moniliformin and zearalenone and their structurally related derivatives.For example, see U.S. Pat. Nos. 5,716,820; 5,792,931; 5,798,255;5,846,812; 6,083,736; 6,538,177; 6,388,171 and 6,812,380.

(R) Cystatin and cysteine proteinase inhibitors. See U.S. Pat. No.7,205,453.

(S) Defensin genes. See WO03000863 and U.S. Pat. Nos. 6,911,577;6,855,865; 6,777,592 and 7,238,781.

(T) Genes conferring resistance to nematodes. See e.g. PCT ApplicationWO96/30517; PCT Application WO93/19181, WO 03/033651 and Urwin et al.,Planta 204:472-479 (1998), Williamson (1999) Curr Opin Plant Bio.2(4):327-31; and U.S. Pat. Nos. 6,284,948 and 7,301,069.

(U) Genes that confer resistance to Phytophthora Root Rot, such as theRps 1, Rps 1-a, Rps 1-b, Rps 1-c, Rps 1-d, Rps 1-e, Rps 1-k, Rps 2, Rps3-a, Rps 3-b, Rps 3-c, Rps 4, Rps 5, Rps 6, Rps 7 and other Rps genes.See, for example, Shoemaker et al, Phytophthora Root Rot Resistance GeneMapping in Soybean, Plant Genome IV Conference, San Diego, Calif.(1995).

(V) Genes that confer resistance to Brown Stem Rot, such as described inU.S. Pat. No. 5,689,035 and incorporated by reference for this purpose.

(W) Genes that confer resistance to Colletotrichum, such as described inUS Patent publication US20090035765 and incorporated by reference forthis purpose. This includes the Rcg locus that may be utilized as asingle locus conversion.

2. Transgenes That Confer Resistance To A Herbicide, For Example:

(A) A herbicide that inhibits the growing point or meristem, such as animidazolinone or a sulfonylurea. Exemplary genes in this category codefor mutant ALS and AHAS enzyme as described, for example, by Lee et al.,EMBO J. 7: 1241 (1988), and Miki et al., Theor. Appl. Genet. 80: 449(1990), respectively. See also, U.S. Pat. Nos. 5,605,011; 5,013,659;5,141,870; 5,767,361; 5,731,180; 5,304,732; 4,761,373; 5,331,107;5,928,937; and 5,378,824; U.S. application Ser. No. 11/683,737, andinternational publication WO 96/33270.

(B) Glyphosate (resistance imparted by mutant5-enolpyruvl-3-phosphikimate synthase (EPSP) and aroA genes,respectively) and other phosphono compounds such as glufosinate(phosphinothricin acetyl transferase (PAT) and Streptomyceshygroscopicus phosphinothricin acetyl transferase (bar) genes), andpyridinoxy or phenoxy proprionic acids and cyclohexones (ACCaseinhibitor-encoding genes). See, for example, U.S. Pat. No. 4,940,835 toShah et al., which discloses the nucleotide sequence of a form of EPSPSwhich can confer glyphosate resistance. U.S. Pat. No. 5,627,061 to Barryet al. also describes genes encoding EPSPS enzymes. See also U.S. Pat.Nos. 6,566,587; 6,338,961; 6,248,876 B1; 6,040,497; 5,804,425;5,633,435; 5,145,783; 4,971,908; 5,312,910; 5,188,642; 4,940,835;5,866,775; 6,225,114 B1; 6,130,366; 5,310,667; 4,535,060; 4,769,061;5,633,448; 5,510,471; Re. 36,449; RE 37,287 E; and U.S. Pat. No.5,491,288; and international publications EP1173580; WO 01/66704;EP1173581 and EP1173582, which are incorporated herein by reference forthis purpose. Glyphosate resistance is also imparted to plants thatexpress a gene that encodes a glyphosate oxido-reductase enzyme asdescribed more fully in U.S. Pat. Nos. 5,776,760 and 5,463,175, whichare incorporated herein by reference for this purpose. In additionglyphosate resistance can be imparted to plants by the over expressionof genes encoding glyphosate N-acetyltransferase. See, for example, U.S.application Ser. Nos. 10/427,692; 10/835,615 and 11/507,751. A DNAmolecule encoding a mutant aroA gene can be obtained under ATCCaccession No. 39256, and the nucleotide sequence of the mutant gene isdisclosed in U.S. Pat. No. 4,769,061 to Comai. European PatentApplication No. 0 333 033 to Kumada et al. and U.S. Pat. No. 4,975,374to Goodman et al. disclose nucleotide sequences of glutamine synthetasegenes which confer resistance to herbicides such as L-phosphinothricin.The nucleotide sequence of a phosphinothricin-acetyl-transferase gene isprovided in European Patent No. 0 242 246 and 0 242 236 to Leemans etal. De Greef et al., Bio/Technology 7: 61 (1989), describe theproduction of transgenic plants that express chimeric bar genes codingfor phosphinothricin acetyl transferase activity. See also, U.S. Pat.Nos. 5,969,213; 5,489,520; 5,550,318; 5,874,265; 5,919,675; 5,561,236;5,648,477; 5,646,024; 6,177,616 B1; and 5,879,903, which areincorporated herein by reference for this purpose. Exemplary genesconferring resistance to phenoxy proprionic acids and cyclohexones, suchas sethoxydim and haloxyfop, are the Acc1-S1, Acc1-S2 and Acc1-S3 genesdescribed by Marshall et al., Theor. Appl. Genet. 83: 435 (1992).

(C) A herbicide that inhibits photosynthesis, such as a triazine (psbAand gs+ genes) and a benzonitrile (nitrilase gene). Przibilla et al.,Plant Cell 3: 169 (1991), describe the transformation of Chlamydomonaswith plasmids encoding mutant psbA genes. Nucleotide sequences fornitrilase genes are disclosed in U.S. Pat. No. 4,810,648 to Stalker, andDNA molecules containing these genes are available under ATCC AccessionNos. 53435, 67441 and 67442. Cloning and expression of DNA coding for aglutathione S-transferase is described by Hayes et al., Biochem. J. 285:173 (1992).

(D) Acetohydroxy acid synthase, which has been found to make plants thatexpress this enzyme resistant to multiple types of herbicides, has beenintroduced into a variety of plants (see, e.g., Hattori et al. (1995)Mol Gen Genet. 246:419). Other genes that confer resistance toherbicides include: a gene encoding a chimeric protein of rat cytochromeP4507A1 and yeast NADPH-cytochrome P450 oxidoreductase (Shiota et al.(1994) Plant Physiol 106:17), genes for glutathione reductase andsuperoxide dismutase (Aono et al. (1995) Plant Cell Physiol 36:1687, andgenes for various phosphotransferases (Datta et al. (1992) Plant MolBiol 20:619).

(E) Protoporphyrinogen oxidase (protox) is necessary for the productionof chlorophyll, which is necessary for all plant survival. The protoxenzyme serves as the target for a variety of herbicidal compounds. Theseherbicides also inhibit growth of all the different species of plantspresent, causing their total destruction. The development of plantscontaining altered protox activity which are resistant to theseherbicides are described in U.S. Pat. Nos. 6,288,306 B1; 6,282,837 B1;and 5,767,373; and international publication WO 01/12825.

3. Transgenes That Confer Or Contribute To An Altered GrainCharacteristic, Such As:

(A) Altered fatty acids, for example, by

-   -   (1) Down-regulation of stearoyl-ACP desaturase to increase        stearic acid content of the plant. See Knultzon et al., Proc.        Natl. Acad. Sci. USA 89: 2624 (1992) and WO99/64579 (Genes for        Desaturases to Alter Lipid Profiles in Corn),    -   (2) Elevating oleic acid via FAD-2 gene modification and/or        decreasing linolenic acid via FAD-3 gene modification (see U.S.        Pat. Nos. 6,063,947; 6,323,392; 6,372,965 and WO 93/11245),    -   (3) Altering conjugated linolenic or linoleic acid content, such        as in WO 01/12800,    -   (4) Altering LEC1, AGP, Dek1, Superal1, mi1 ps, various Ipa        genes such as Ipa1, Ipa3, hpt or hggt. For example, see WO        02/42424, WO 98/22604, WO 03/011015, WO02/057439, WO03/011015,        U.S. Pat. Nos. 6,423,886, 6,197,561, 6,825,397, and U.S.        Application Serial Nos. US2003/0079247, US2003/0204870, and        Rivera-Madrid, R. et al. Proc. Natl. Acad. Sci. 92:5620-5624        (1995).

B) Altered phosphorus content, for example, by the

-   -   (1) Introduction of a phytase-encoding gene would enhance        breakdown of phytate, adding more free phosphate to the        transformed plant. For example, see Van Hartingsveldt et al.,        Gene 127: 87 (1993), for a disclosure of the nucleotide sequence        of an Aspergillus niger phytase gene.    -   (2) Modulating a gene that reduces phytate content. In maize,        this, for example, could be accomplished, by cloning and then        re-introducing DNA associated with one or more of the alleles,        such as the LPA alleles, identified in maize mutants        characterized by low levels of phytic acid, such as in WO        05/113778 and/or by altering inositol kinase activity as in WO        02/059324, US2003/0009011, WO 03/027243, US2003/0079247, WO        99/05298, U.S. Pat. No. 6,197,561, U.S. Pat. No. 6,291,224, U.S.        Pat. No. 6,391,348, WO2002/059324, US2003/0079247, Wo98/45448,        WO99/55882, WO01/04147.

(C) Altered carbohydrates affected, for example, by altering a gene foran enzyme that affects the branching pattern of starch or, a genealtering thioredoxin such as NTR and/or TRX (see. (See U.S. Pat. No.6,531,648 which is incorporated by reference for this purpose) and/or agamma zein knock out or mutant such as cs27 or TUSC27 or en27 (See U.S.Pat. No. 6,858,778 and US2005/0160488, US2005/0204418; which areincorporated by reference for this purpose). See Shiroza et al., J.Bacteriol. 170: 810 (1988) (nucleotide sequence of Streptococcus mutansfructosyltransferase gene), Steinmetz et al., Mol. Gen. Genet. 200: 220(1985) (nucleotide sequence of Bacillus subtilis levansucrase gene), Penet al., Bio/Technology 10: 292 (1992) (production of transgenic plantsthat express Bacillus licheniformis alpha-amylase), Elliot et al., PlantMolec. Biol. 21: 515 (1993) (nucleotide sequences of tomato invertasegenes), Søgaard et al., J. Biol. Chem. 268: 22480 (1993) (site-directedmutagenesis of barley alpha-amylase gene), and Fisher et al., PlantPhysiol. 102: 1045 (1993) (maize endosperm starch branching enzyme II),WO 99/10498 (improved digestibility and/or starch extraction throughmodification of UDP-D-xylose 4-epimerase, Fragile 1 and 2, Ref1, HCHL,C4H), U.S. Pat. No 6,232,529 (method of producing high oil seed bymodification of starch levels (AGP)). The fatty acid modification genesmentioned herein may also be used to affect starch content and/orcomposition through the interrelationship of the starch and oilpathways.

(D) Altered antioxidant content or composition, such as alteration oftocopherol or tocotrienols. For example, see U.S. Pat. No. 6,787,683,US2004/0034886 and WO 00/68393 involving the manipulation of antioxidantlevels, and WO 03/082899 through alteration of a homogentisate geranylgeranyl transferase (hggt).

(E) Altered essential seed amino acids. For example, see U.S. Pat. No.6,127,600 (method of increasing accumulation of essential amino acids inseeds), U.S. Pat. No. 6,080,913 (binary methods of increasingaccumulation of essential amino acids in seeds), U.S. Pat. No. 5,990,389(high lysine), WO99/40209 (alteration of amino acid compositions inseeds), WO99/29882 (methods for altering amino acid content ofproteins), U.S. Pat. No. 5,850,016 (alteration of amino acidcompositions in seeds), WO98/20133 (proteins with enhanced levels ofessential amino acids), U.S. Pat. No. 5,885,802 (high methionine), U.S.Pat. No. 5,885,801 (high threonine), U.S. Pat. No. 6,664,445 (plantamino acid biosynthetic enzymes), U.S. Pat. No. 6,459,019 (increasedlysine and threonine), U.S. Pat. No. 6,441,274 (plant tryptophansynthase beta subunit), U.S. Pat. No. 6,346,403 (methionine metabolicenzymes), U.S. Pat. No. 5,939,599 (high sulfur), U.S. Pat. No. 5,912,414(increased methionine), WO98/56935 (plant amino acid biosyntheticenzymes), WO98/45458 (engineered seed protein having higher percentageof essential amino acids), WO98/42831 (increased lysine), U.S. Pat. No.5,633,436 (increasing sulfur amino acid content), U.S. Pat. No.5,559,223 (synthetic storage proteins with defined structure containingprogrammable levels of essential amino acids for improvement of thenutritional value of plants), WO96/01905 (increased threonine),WO95/15392 (increased lysine), US2003/0163838, US2003/0150014,US2004/0068767, U.S. Pat. No. 6,803,498, WO01/79516.

4. Genes that Control Male-sterility:

There are several methods of conferring genetic male sterilityavailable, such as multiple mutant genes at separate locations withinthe genome that confer male sterility, as disclosed in U.S. Pat. Nos.4,654,465 and 4,727,219 to Brar et al. and chromosomal translocations asdescribed by Patterson in U.S. Pat. Nos. 3,861,709 and 3,710,511. Inaddition to these methods, Albertsen et al., U.S. Pat. No. 5,432,068,describe a system of nuclear male sterility which includes: identifyinga gene which is critical to male fertility; silencing this native genewhich is critical to male fertility; removing the native promoter fromthe essential male fertility gene and replacing it with an induciblepromoter; inserting this genetically engineered gene back into theplant; and thus creating a plant that is male sterile because theinducible promoter is not “on” resulting in the male fertility gene notbeing transcribed. Fertility is restored by inducing, or turning “on”,the promoter, which in turn allows the gene that confers male fertilityto be transcribed.

(A) Introduction of a deacetylase gene under the control of atapetum-specific promoter and with the application of the chemicalN-Ac-PPT (WO 01/29237).

(B) Introduction of various stamen-specific promoters (WO 92/13956, WO92/13957).

(C) Introduction of the barnase and the barstar gene (Paul et al. PlantMol. Biol. 19:611-622, 1992).

For additional examples of nuclear male and female sterility systems andgenes, see also, U.S. Pat. Nos. 5,859,341; 6,297,426; 5,478,369;5,824,524; 5,850,014; and 6,265,640; all of which are herebyincorporated by reference.

5. Genes that create a site for site specific DNA integration. Thisincludes the introduction of FRT sites that may be used in the FLP/FRTsystem and/or Lox sites that may be used in the Cre/Loxp system. Forexample, see Lyznik, et al., Site-Specific Recombination for GeneticEngineering in Plants, Plant Cell Rep (2003) 21:925-932 and WO 99/25821which are hereby incorporated by reference. Other systems that may beused include the Gin recombinase of phage Mu (Maeser et al., 1991; VickiChandler, The Maize Handbook ch. 118 (Springer-Verlag 1994), the Pinrecombinase of E. coli (Enomoto et al., 1983), and the R/RS system ofthe pSR1 plasmid (Araki et al., 1992).6. Genes that affect abiotic stress resistance (including but notlimited to flowering, ear and seed development, enhancement of nitrogenutilization efficiency, altered nitrogen responsiveness, droughtresistance or tolerance, cold resistance or tolerance, and saltresistance or tolerance) and increased yield under stress. For example,see: WO 00/73475 where water use efficiency is altered throughalteration of malate; U.S. Pat. Nos. 5,892,009, 5,965,705, 5,929,305,5,891,859, 6,417,428, 6,664,446, 6,706,866, 6,717,034, 6,801,104,WO2000060089, WO2001026459, WO2001035725, WO2001034726, WO2001035727,WO2001036444, WO2001036597, WO2001036598, WO2002015675, WO2002017430,WO2002077185, WO2002079403, WO2003013227, WO2003013228, WO2003014327,WO2004031349, WO2004076638, WO9809521, and WO9938977 describing genes,including CBF genes and transcription factors effective in mitigatingthe negative effects of freezing, high salinity, and drought on plants,as well as conferring other positive effects on plant phenotype;US2004/0148654 and WO01/36596 where abscisic acid is altered in plantsresulting in improved plant phenotype such as increased yield and/orincreased tolerance to abiotic stress; WO2000/006341, WO04/090143, U.S.application Ser. Nos. 10/817,483 and 09/545,334 where cytokininexpression is modified resulting in plants with increased stresstolerance, such as drought tolerance, and/or increased yield. Also seeWO0202776, WO2003052063, JP2002281975, U.S. Pat. No. 6,084,153,WO0164898, U.S. Pat. No. 6,177,275, and U.S. Pat. No. 6,107,547(enhancement of nitrogen utilization and altered nitrogenresponsiveness). For ethylene alteration, see US20040128719,US20030166197 and WO200032761. For plant transcription factors ortranscriptional regulators of abiotic stress, see e.g. US20040098764 orUS20040078852.

Other genes and transcription factors that affect plant growth andagronomic traits such as yield, flowering, plant growth and/or plantstructure, can be introduced or introgressed into plants, see e.g.WO97/49811 (LHY), WO98/56918 (ESD4), WO97/10339 and U.S. Pat. No.6,573,430 (TFL), U.S. Pat. No. 6,713,663 (FT), WO96/14414 (CON),WO96/38560, WO01/21822 (VRN1), WO00/44918 (VRN2), WO99/49064 (GI),WO00/46358 (FRI), WO97/29123, U.S. Pat. No. 6,794,560, U.S. Pat. No.6,307,126 (GAI), WO99/09174 (D8 and Rht), and WO2004076638 andWO2004031349 (transcription factors).

Using PHWRZ to Develop Another Maize Plant

Maize varieties such as PHWRZ are typically developed for use in theproduction of hybrid maize varieties. However, varieties such as PHWRZalso provide a source of breeding material that may be used to developnew maize inbred varieties. Plant breeding techniques known in the artand used in a maize plant breeding program include, but are not limitedto, recurrent selection, mass selection, bulk selection, mass selection,backcrossing, pedigree breeding, open pollination breeding, restrictionfragment length polymorphism enhanced selection, genetic marker enhancedselection, making double haploids, and transformation. Oftencombinations of these techniques are used. The development of maizehybrids in a maize plant breeding program requires, in general, thedevelopment of homozygous inbred varieties, the crossing of thesevarieties, and the evaluation of the crosses. There are many analyticalmethods available to evaluate the result of a cross. The oldest and mosttraditional method of analysis is the observation of phenotypic traitsbut genotypic analysis may also be used.

This invention is also directed to methods for producing a maize plantby crossing a first parent maize plant with a second parent maize plantwherein either the first or second parent maize plant is an maize plantof the variety PHWRZ. The other parent may be any other maize plant,such as another inbred variety or a plant that is part of a synthetic ornatural population. Any such methods using the maize variety PHWRZ arepart of this invention: selfing, sibbing, backcrosses, mass selection,pedigree breeding, bulk selection, hybrid production, crosses topopulations, and the like. These methods are well known in the art andsome of the more commonly used breeding methods are described below.Descriptions of breeding methods can also be found in one of severalreference books (e.g., Allard, Principles of Plant Breeding, 1960;Simmonds, Principles of Crop Improvement, 1979; Fehr, “Breeding Methodsfor Cultivar Development”, Production and Uses, 2^(nd) ed., Wilcoxeditor, 1987 the disclosure of which is incorporated herein byreference).

Pedigree Breeding

Pedigree breeding starts with the crossing of two genotypes, such asPHWRZ and one other inbred variety having one or more desirablecharacteristics that is lacking or which complements PHWRZ. If the twooriginal parents do not provide all the desired characteristics, othersources can be included in the breeding population. In the pedigreemethod, superior plants are selfed and selected in successive filialgenerations. In the succeeding filial generations the heterozygouscondition gives way to homogeneous varieties as a result ofself-pollination and selection. Typically in the pedigree method ofbreeding, five or more successive filial generations of selfing andselection is practiced: F1→>F2; F2→>F3; F3→>F4; F4→>F5, etc. After asufficient amount of inbreeding, successive filial generations willserve to increase seed of the developed inbred. Preferably, the inbredvariety comprises homozygous alleles at about 95% or more of its loci.

Recurrent Selection and Mass Selection

Recurrent selection is a method used in a plant breeding program toimprove a population of plants. PHWRZ is suitable for use in a recurrentselection program. The method entails individual plants crosspollinating with each other to form progeny. The progeny are grown andthe superior progeny selected by any number of selection methods, whichinclude individual plant, half-sib progeny, full-sib progeny, selfedprogeny and topcrossing. The selected progeny are cross pollinated witheach other to form progeny for another population. This population isplanted and again superior plants are selected to cross pollinate witheach other. Recurrent selection is a cyclical process and therefore canbe repeated as many times as desired. The objective of recurrentselection is to improve the traits of a population. The improvedpopulation can then be used as a source of breeding material to obtaininbred varieties to be used in hybrids or used as parents for asynthetic cultivar. A synthetic cultivar is the resultant progeny formedby the intercrossing of several selected inbreds.

PHWRZ is suitable for use in mass selection. Mass selection is a usefultechnique when used in conjunction with molecular marker enhancedselection. In mass selection seeds from individuals are selected basedon phenotype and/or genotype. These selected seeds are then bulked andused to grow the next generation. Bulk selection requires growing apopulation of plants in a bulk plot, allowing the plants toself-pollinate, harvesting the seed in bulk and then using a sample ofthe seed harvested in bulk to plant the next generation. Instead of selfpollination, directed pollination could be used as part of the breedingprogram.

Mutation Breeding

Mutation breeding is one of many methods that could be used to introducenew traits into PHWRZ. PHWRZ is suitable for use in a mutation breedingprogram. Mutations that occur spontaneously or are artificially inducedcan be useful sources of variability for a plant breeder. The goal ofartificial mutagenesis is to increase the rate of mutation for a desiredcharacteristic. Mutation rates can be increased by many different meansincluding temperature, long-term seed storage, tissue cultureconditions, radiation; such as X-rays, Gamma rays (e.g. cobalt 60 orcesium 137), neutrons, (product of nuclear fission by uranium 235 in anatomic reactor), Beta radiation (emitted from radioisotopes such asphosphorus 32 or carbon 14), or ultraviolet radiation (preferably from2500 to 2900 nm), or chemical mutagens (such as base analogues(5-bromo-uracil), related compounds (8-ethoxy caffeine), antibiotics(streptonigrin), alkylating agents (sulfur mustards, nitrogen mustards,epoxides, ethylenamines, sulfates, sulfonates, sulfones, lactones),azide, hydroxylamine, nitrous acid, or acridines. Once a desired traitis observed through mutagenesis the trait may then be incorporated intoexisting germplasm by traditional breeding techniques, such asbackcrossing. Details of mutation breeding can be found in “Principlesof Cultivar Development” Fehr, 1993 Macmillan Publishing Company, thedisclosure of which is incorporated herein by reference. In addition,mutations created in other varieties may be used to produce a backcrossconversion of PHWRZ that comprises such mutation.

Production of Double Haploids

The production of double haploids can also be used for the developmentof inbreds in the breeding program. For example, an F1 hybrid for whichPHWRZ is a parent can be used to produce double haploid plants. Doublehaploids are produced by the doubling of a set of chromosomes (1N) froma heterozygous plant to produce a completely homozygous individual. Forexample, see Wan et al., “Efficient Production of Doubled Haploid PlantsThrough Colchicine Treatment of Anther-Derived Maize Callus”,Theoretical and Applied Genetics, 77:889-892, 1989 and US2003/0005479.This can be advantageous because the process omits the generations ofselfing needed to obtain a homozygous plant from a heterozygous source.

Haploid induction systems have been developed for various plants toproduce haploid tissues, plants and seeds. The haploid induction systemcan produce haploid plants from any genotype by crossing a selectedvariety (as female) with an inducer variety. Such inducer varieties formaize include Stock 6 (Coe, 1959, Am. Nat. 93:381-382; Sharkar and Coe,1966, Genetics 54:453-464) RWS (see world wide web sitewww.uni-hohenheim.de/%07Eipspwww/350b/indexe.html#Project3), KEMS(Deimling, Roeber, and Geiger, 1997, Vortr. Pflanzenzuchtg 38:203-224),or KMS and ZMS (Chalyk, Bylich & Chebotar, 1994, MNL 68:47; Chalyk &Chebotar, 2000, Plant Breeding 119:363-364), and indeterminategametophyte (ig) mutation (Kermicle 1969 Science 166:1422-1424). Thedisclosures of which are incorporated herein by reference.

Methods for obtaining haploid plants are also disclosed in Kobayashi, M.et al., Journ. of Heredity 71(1):9-14, 1980, Pollacsek, M., Agronomie(Paris) 12(3):247-251, 1992; Cho-Un-Haing et al., Journ. of Plant Biol.,1996, 39(3):185-188; Verdoodt, L., et al., February 1998, 96(2):294-300;Genetic Manipulation in Plant Breeding, Proceedings InternationalSymposium Organized by EUCARPIA, Sep. 8-13, 1985, Berlin, Germany;Chalyk et al., 1994, Maize Genet Coop. Newsletter 68:47; Chalyk, S. T.,1999, Maize Genet. Coop. Newsletter 73:53-54; Coe, R. H., 1959, Am. Nat.93:381-382; Deimling, S. et al., 1997, Vortr. Pflanzenzuchtg 38:203-204;Kato, A., 1999, J. Hered. 90:276-280; Lashermes, P. et al., 1988, Theor.Appl. Genet. 76:570-572 and 76:405-410; Tyrnov, V. S. et al., 1984,Dokl. Akad. Nauk. SSSR 276:735-738; Zabirova, E. R. et al., 1996,Kukuruza I Sorgo N4, 17-19; Aman, M. A., 1978, Indian J. Genet PlantBreed 38:452-457; Chalyk S. T., 1994, Euphytica 79:13-18; Chase, S. S.,1952, Agron. J. 44:263-267; Coe, E. H., 1959, Am. Nat. 93:381-382; Coe,E. H., and Sarkar, K. R., 1964 J. Hered. 55:231-233; Greenblatt, I. M.and Bock, M., 1967, J. Hered. 58:9-13; Kato, A., 1990, Maize Genet.Coop. Newsletter 65:109-110; Kato, A., 1997, Sex. Plant Reprod.10:96-100; Nanda, D. K. and Chase, S. S., 1966, Crop Sci. 6:213-215;Sarkar, K. R. and Coe, E. H., 1966, Genetics 54:453-464; Sarkar, K. R.and Coe, E. H., 1971, Crop Sci. 11:543-544; Sarkar, K. R. and Sachan J.K. S., 1972, Indian J. Agric. Sci. 42:781-786; Kermicle J. L., 1969,Mehta Yeshwant, M. R., Genetics and Molecular Biology, September 2000,23(3):617-622; Tahir, M. S. et al. Pakistan Journal of Scientific andIndustrial Research, August 2000, 43(4):258-261; Knox, R. E. et al.Plant Breeding, August 2000, 119(4):289-298; U.S. Pat. No. 5,639,951 andU.S. patent application Ser. No. 10/121,200, the disclosures of whichare incorporated herein by reference.

Thus, an embodiment of this invention is a process for making ahomozygous PHWRZ progeny plant substantially similar to PHWRZ byproducing or obtaining a seed from the cross of PHWRZ and another maizeplant and applying double haploid methods to the F1 seed or F1 plant orto any successive filial generation. Such methods decrease the number ofgenerations required to produce an inbred with similar genetics orcharacteristics to PHWRZ. See Bernardo, R. and Kahler, A. L., Theor.Appl. Genet. 102:986-992, 2001.

In particular, a process of making seed substantially retaining themolecular marker profile of maize variety PHWRZ is contemplated, suchprocess comprising obtaining or producing F1 hybrid seed for which maizevariety PHWRZ is a parent, inducing double haploids to create progenywithout the occurrence of meiotic segregation, obtaining the molecularmarker profile of maize variety PHWRZ, and selecting progeny that retainthe molecular marker profile of PHWRZ.

Use of PHWRZ in Tissue Culture

This invention is also directed to the use of PHWRZ in tissue culture.As used herein, the term “tissue culture” includes plant protoplasts,plant cell tissue culture, cultured microspores, plant calli, plantclumps, and the like. As used herein, phrases such as “growing the seed”or “grown from the seed” include embryo rescue, isolation of cells fromseed for use in tissue culture, as well as traditional growing methods.

Duncan, Williams, Zehr, and Widholm, Planta (1985) 165:322-332 reflectsthat 97% of the plants cultured that produced callus were capable ofplant regeneration. Subsequent experiments with both inbreds and hybridsproduced 91% regenerable callus that produced plants. In a further studyin 1988, Songstad, Duncan & Widholm in Plant Cell Reports (1988),7:262-265 reports several media additions that enhance regenerability ofcallus of two inbred varieties. Other published reports also indicatedthat “nontraditional” tissues are capable of producing somaticembryogenesis and plant regeneration. K. P. Rao, et al., Maize GeneticsCooperation Newsletter, 60:64-65 (1986), refers to somatic embryogenesisfrom glume callus cultures and B. V. Conger, et al., Plant Cell Reports,6:345-347 (1987) indicates somatic embryogenesis from the tissuecultures of maize leaf segments. Thus, it is clear from the literaturethat the state of the art is such that these methods of obtaining plantsare, and were, “conventional” in the sense that they are routinely usedand have a very high rate of success.

Tissue culture of maize, including tassel/anther culture, is describedin U.S. 2002/0062506A1 and European Patent Application, publicationEP0160,390, each of which are incorporated herein by reference for thispurpose. Maize tissue culture procedures are also described in Green andRhodes, “Plant Regeneration in Tissue Culture of Maize,” Maize forBiological Research (Plant Molecular Biology Association,Charlottesville, Va. 1982, at 367-372) and in Duncan, et al., “TheProduction of Callus Capable of Plant Regeneration from Immature Embryosof Numerous Zea Mays Genotypes,” 165 Planta 322-332 (1985). Thus,another aspect of this invention is to provide cells which upon growthand differentiation produce maize plants having the genotype and/orphenotypic characteristics of variety PHWRZ.

INDUSTRIAL APPLICABILITY

Maize is used as human food, livestock feed, and as raw material inindustry. The food uses of maize, in addition to human consumption ofmaize kernels, include both products of dry- and wet-milling industries.The principal products of maize dry milling are grits, meal and flour.The maize wet-milling industry can provide maize starch, maize syrups,and dextrose for food use. Maize oil is recovered from maize germ, whichis a by-product of both dry- and wet-milling industries.

Maize, including both grain and non-grain portions of the plant, is alsoused extensively as livestock feed, primarily for beef cattle, dairycattle, hogs, and poultry.

Industrial uses of maize include production of ethanol, maize starch inthe wet-milling industry and maize flour in the dry-milling industry.The industrial applications of maize starch and flour are based onfunctional properties, such as viscosity, film formation, adhesiveproperties, and ability to suspend particles. The maize starch and flourhave application in the paper and textile industries. Other industrialuses include applications in adhesives, building materials, foundrybinders, laundry starches, explosives, oil-well muds, and other miningapplications.

Plant parts other than the grain of maize are also used in industry: forexample, stalks and husks are made into paper and wallboard and cobs areused for fuel and to make charcoal.

The seed of maize variety PHWRZ, the plant produced from the seed, thehybrid maize plant produced from the crossing of the variety, hybridseed, and various parts of the hybrid maize plant and transgenicversions of the foregoing, can be utilized for human food, livestockfeed, and as a raw material in industry.

TABLE 1 VARIETY DESCRIPTION INFORMATION PHWRZ 1. TYPE: (Describeintermediate types in comments section) AVG STDEV N 1 = Sweet, 2 = Dent,3 = Flint, 4 = Flour, 5 = Pop and 6 = Ornamental. 3 Comments: Flint-Dent2. MATURITY: DAYS HEAT UNITS Days H. Units Emergence to 50% of plants insilk 61 1,241 Emergence to 50% of plants in pollen shed 63 1,293 10% to90% pollen shed 3 54 3. PLANT: Plant Height (to tassel tip) (cm) 204.78.25 18 Ear Height (to base of top ear node) (cm) 77.9 6.27 18 Length ofTop Ear Internode (cm) 13.2 1.59 18 Average Number of Tillers per Plant0.0 0.00 2 Average Number of Ears per Stalk 1.1 0.08 2 Anthocyanin ofBrace Roots: 1 = Absent, 2 = Faint, 1 3 = Moderate, 4 = Dark 4. LEAF:Width of Ear Node Leaf (cm) 10.1 0.87 18 Length of Ear Node Leaf (cm)75.3 4.84 18 Number of Leaves above Top Ear 5.3 0.49 18 Leaf Angle: (atanthesis, 2nd leaf above ear to 33.1 4.25 18 stalk above leaf)(Degrees) * Leaf Color: V. Dark Green Munsell: 7.5GY34 Leaf SheathPubescence: 1 = none to 9 = like peach fuzz 2 5. TASSEL: Number ofPrimary Lateral Branches 3.6 1.15 18 Branch Angle from Central Spike(Degrees) 12.2 4.28 18 Tassel Length: (from peduncle node to tasseltip), (cm). 47.9 2.52 18 Pollen Shed: 0 = male sterile, 9 = heavy shed3 * Anther Color: Yellow Munsell: 10YR814 * Glume Color: Red Munsell:10RP310 Bar Glumes (glume bands): 1 = absent, 2 = present 1 PeduncleLength: (from top leaf node to lower florets or 16.2 2.18 18 branches),(cm). 6a. EAR (Unhusked ear) * Silk color: Light Green Munsell: 2.5GY86(3 days after silk emergence) * Fresh husk color: Med. Green Munsell:2.5GY66 * Dry husk color: Buff Munsell: 2.5Y84 (65 days after 50%silking) Ear position at dry husk stage: 1 = upright, 2 = horizontal, 13 = pendant Husk Tightness: (1 = very loose, 9 = very tight) 8 HuskExtension (at harvest): 1 = short (ears exposed), 2 2 = medium (<8 cm),3 = long (8-10 cm), 4 = v. long (>10 cm) 6b. EAR (Husked ear data) EarLength (cm): 16.9 0.90 18 Ear Diameter at mid-point (mm) 42.3 1.28 18Ear Weight (gm): 151.4 11.40 18 Number of Kernel Rows: 15.1 1.23 18Kernel Rows: 1 = indistinct, 2 = distinct 2 Row Alignment: 1 = straight,2 = slightly curved, 3 = spiral 2 Shank Length (cm): 13.1 2.01 18 EarTaper: 1 = slight cylind., 2 = average, 3 = extreme conic. 2 7. KERNEL(Dried): Kernel Length (mm): 12.0 0.69 18 Kernel Width (mm): 7.8 0.43 18Kernel Thickness (mm): 4.7 0.57 18 Round Kernels (shape grade) (%) 42.01.01 2 Aleurone Color Pattern: 1 = homozygous, 2 = segregating 2 *Aleurone Color: Yellow Munsell: 10YR714 * Hard Endo. Color: YellowMunsell: 10YR712 Endosperm Type: 3 1 = sweet (su1), 2 = extra sweet(sh2), 3 = normal starch, 4 = high amylose starch, 5 = waxy starch, 6 =high protein, 7 = high lysine, 8 = super sweet (se), 9 = high oil, 10 =other Weight per 100 Kernels (unsized sample) (gm): 27.0 1.41 2 8. COB:Cob Diameter at mid-point (mm): 20.7 1.56 18 * Cob Color: White Munsell:2.5Y92 9. DISEASE RESISTANCE: (Rate from 1 = most-susceptible to 9 =most-resistant. Leave blank if not tested, leave race or strain optionsblank if polygenic.) A. LEAF BLIGHTS, WILTS, AND LOCAL INFECTIONDISEASES Anthracnose Leaf Blight (Colletotrichum graminicola) 4 CommonRust (Puccinia sorghi) Common Smut (Ustilago maydis) Eyespot (Kabatiellazeae) Goss's Wilt (Clavibacter michiganense spp. nebraskense) 4 GrayLeaf Spot (Cercospora zeae-maydis) Helminthosporium Leaf Spot (Bipolariszeicola) Race: 6 Northern Leaf Blight (Exserohilum turcicum) Race:Southern Leaf Blight (Bipolaris maydis) Race: Southern Rust (Pucciniapolysora) Stewart's Wilt (Erwinia stewartii) Other (Specify):___________________ B. SYSTEMIC DISEASES Corn Lethal Necrosis (MCMV andMDMV) 6 Head Smut (Sphacelotheca reiliana) Maize Chlorotic Dwarf Virus(MDV) Maize Chlorotic Mottle Virus (MCMV) Maize Dwarf Mosaic Virus(MDMV) Sorghum Downy Mildew of Corn (Peronosclerospora sorghi) Other(Specify): ___________________ C. STALK ROTS 6 Anthracnose Stalk Rot(Colletotrichum graminicola) Diplodia Stalk Rot (Stenocarpella maydis)Fusarium Stalk Rot (Fusarium moniliforme) Gibberella Stalk Rot(Gibberella zeae) Other (Specify): ___________________ D. EAR AND KERNELROTS Aspergillus Ear and Kernel Rot (Aspergillus flavus) Diplodia EarRot (Stenocarpella maydis) 5 Fusarium Ear and Kernel Rot (Fusariummoniliforme) 8 Gibberella Ear Rot (Gibberella zeae) Other (Specify):___________________ 10. INSECT RESISTANCE: (Rate from 1 = most-suscept.to 9 = most-resist., leave blank if not tested.) Corn Worm (Helicoverpazea) ___ Leaf Feeding ___ Silk Feeding ___ Ear Damage Corn Leaf Aphid(Rophalosiphum maydis) Corn Sap Beetle (Capophilus dimidiatus) EuropeanCorn Borer (Ostrinia nubilalis) 1st. Generation (Typically whorl leaffeeding) 2nd. Generation (Typically leaf sheath-collar feeding) ___Stalk Tunneling ___ cm tunneled/plant Fall armyworm (Spodopterafruqiperda) ___ Leaf Feeding ___ Silk Feeding ___ mg larval wt. MaizeWeevil (Sitophilus zeamaize) Northern Rootworm (Diabrotica barberi)Southern Rootworm (Diabrotica undecimpunctata) Southwestern Corn Borer(Diatreaea grandiosella) ___ Leaf Feeding ___ Stalk Tunneling ___ cmtunneled/plant Two-spotted Spider Mite (Tetranychus utricae) WesternRootworm (Diabrotica virgifrea virgifrea) Other (Specify):___________________ 11. AGRONOMIC TRAITS: 6 Staygreen (at 65 days afteranthesis; rate from 1-worst to 9-excellent) % Dropped Ears (at 65 daysafter anthesis) % Pre-anthesis Brittle Snapping 50 % Pre-anthesis RootLodging % Post-anthesis Root Lodging (at 65 days after anthesis) %Post-anthesis Stalk Lodging Kg/ha (Yield at 12-13% grain moisture) *Munsell Glossy Book of color, (A standard color reference). KollmorgenInst. Corp. New Windsor, NY.

TABLE 2A PAIRED INBRED COMPARISON REPORT Variety #1: PHWRZ Variety #2:PHHMH GLFSPT NLFBLT FUSERS EGRWTH ESTCNT SCORE SCORE SCORE SCORE COUNTStat ABS ABS ABS ABS ABS Mean1 4.0 7.0 6.5 4.0 27.5 Mean2 4.0 7.0 4.86.0 32.5 Locs 1 1 4 1 2 Reps 1 1 4 1 2 Diff 0.0 0.0 1.8 −2.0 −5.0 Prob .. 0.006 . 0.558 TILLER GDUSHD GDUSLK TASSZ PLTHT PCT GDU GDU SCORE CMStat ABS ABS ABS ABS ABS Mean1 1.4 131.9 128.8 4.3 202.9 Mean2 1.6 135.8135.7 2.5 215.4 Locs 10 37 37 34 31 Reps 10 37 37 34 31 Diff 0.1 −4.0−6.9 1.8 −12.5 Prob 0.913 0.000 0.000 0.000 0.000 EARHT STAGRN TEXEARBARPLT ERTLPN CM SCORE SCORE % NOT % NOT Stat ABS ABS ABS ABS ABS Mean180.6 6.0 2.8 94.7 100.0 Mean2 77.0 5.2 4.5 92.5 100.0 Locs 30 5 4 20 1Reps 30 5 4 20 1 Diff 3.6 0.8 −1.8 2.2 0.0 Prob 0.080 0.178 0.006 0.137.

TABLE 2B PAIRED INBRED COMPARISON REPORT Variety #1: PHWRZ Variety #2:PH7CR NLFBLT FUSERS TILLER SCORE SCORE PCT Stat ABS ABS ABS Mean1 6.04.5 3.4 Mean2 4.0 4.8 1.1 Locs 1 4 3 Reps 1 4 3 Diff 2.0 −0.3 −2.3 Prob. 0.391 0.423 GDUSHD GDUSLK TASSZ GDU GDU SCORE Stat ABS ABS ABS Mean1134.9 129.1 4.3 Mean2 140.2 139.5 3.5 Locs 9 9 8 Reps 9 9 8 Diff −5.3−10.4 0.8 Prob 0.018 0.000 0.048 PLTHT COMRST EARHT CM SCORE CM Stat ABSABS ABS Mean1 200.4 4.0 80.8 Mean2 217.7 3.0 86.8 Locs 8 1 8 Reps 8 1 8Diff −17.4 1.0 −6.0 Prob 0.000 . 0.160 STAGRN TEXEAR BARPLT SCORE SCORE% NOT Stat ABS ABS ABS Mean1 8.0 2.5 87.6 Mean2 7.0 4.0 90.9 Locs 1 2 6Reps 1 2 6 Diff 1.0 −1.5 −3.4 Prob . 0.205 0.206

TABLE 3 GENERAL COMBINING ABILITY REPORT FOR PHWRZ. Year ALL PRM Day ABSMean 99 PRM Day ABS Reps 213 PRMSHD Day ABS Mean 100 PRMSHD Day ABS Reps213 YIELD bu/a 56# ABS Mean 190.7 YIELD bu/a 56# ABS Reps 131 YIELD bu/a56# ABS Years 2 YIELD bu/a 56# % MN Mean 101.3 YIELD bu/a 56# % MN Reps131 MST pct ABS Mean 20.9 MST pct ABS Reps 131 MST pct % MN Mean 100.6MST pct % MN Reps 131 YLDMST Value ABS Mean 100.7 YLDMST Value ABS Reps131 STLPCN % NOT % MN Mean 99 STLPCN % NOT % MN Reps 9 STLLPN % NOT % MNMean 107 STLLPN % NOT % MN Reps 30 ERTLPN % NOT % MN Mean 111 ERTLPN %NOT % MN Reps 2 LRTLPN % NOT % MN Mean 111 LRTLPN % NOT % MN Reps 16TSTWT lb/bu % MN Mean 99.3 TSTWT lb/bu % MN Reps 78 STKCNT count % MNMean 100 STKCNT count % MN Reps 180 PLTHT cm % MN Mean 100 PLTHT cm % MNReps 51 EARHT cm % MN Mean 99 EARHT cm % MN Reps 51 BRTSTK % NOT % MNMean BRTSTK % NOT % MN Reps BRLPNE pct NOT ABS Mean BRLPNE pct NOT ABSReps BRLPNL pct NOT ABS Mean BRLPNL pct NOT ABS Reps GLFSPT score ABSMean 4 GLFSPT score ABS Reps 9 STAGRN score ABS Mean 5 STAGRN score ABSReps 14 HSKCVR score ABS Mean 7 HSKCVR score ABS Reps 1 ECBLSI score ABSMean 3 ECBLSI score ABS Reps 1

TABLE 4A INBREDS IN HYBRID COMBINATION REPORT Variety #1: HYBRIDCONTAINING PHWRZ Variety #2: 36K67 YIELD GLFSPT YIELD NLFBLT MST BU/A56# SCORE BU/A 56# SCORE PCT Stat ABS ABS % MN ABS ABS Mean1 207.3 4.5107.9 4.5 23.8 Mean2 204.5 3.5 105.9 5.8 24.6 Locs 32 2 32 2 32 Reps 402 40 3 40 Diff 2.8 1.0 2.0 −1.3 0.8 Prob 0.499 0.500 0.371 0.344 0.005TSTWT STKCNT GDUSHD GDUSLK PLTHT LB/BU COUNT GDU GDU CM Stat ABS ABS ABSABS ABS Mean1 54.4 53.4 124.5 124.6 284.8 Mean2 55.7 53.4 129.4 129.3287.5 Locs 9 44 11 8 11 Reps 9 53 13 10 13 Diff −1.3 0.1 −5.0 −4.7 −2.7Prob 0.077 0.790 0.002 0.013 0.425 EARHT STAGRN GIBROT STLLPN LRTLPN CMSCORE SCORE % NOT % NOT Stat ABS ABS ABS ABS ABS Mean1 124.1 4.7 6.089.0 83.5 Mean2 124.7 6.2 8.0 96.6 90.0 Locs 11 3 1 5 2 Reps 13 4 1 5 2Diff −0.7 −1.5 −2.0 −7.6 −6.5 Prob 0.807 0.225 . 0.246 0.315

TABLE 4B INBREDS IN HYBRID COMBINATION REPORT Variety #1: HYBRIDCONTAINING PHWRZ Variety #2: 36W66 YIELD GLFSPT YIELD MST TSTWT BU/A 56#SCORE BU/A 56# PCT LB/BU Stat ABS ABS % MN ABS ABS Mean1 218.0 4.5 108.021.9 54.2 Mean2 206.0 4.5 102.0 23.4 54.7 Locs 20 2 20 20 9 Reps 20 2 2020 9 Diff 12.1 0.0 6.1 1.5 −0.6 Prob 0.007 1.000 0.007 0.003 0.197STKCNT GDUSHD GDUSLK PLTHT EARHT COUNT GDU GDU CM CM Stat ABS ABS ABSABS ABS Mean1 52.6 127.0 123.0 290.3 127.8 Mean2 53.1 127.5 126.0 280.6115.1 Locs 26 4 1 7 7 Reps 26 4 1 7 7 Diff −0.5 −0.5 −3.0 9.8 12.7 Prob0.237 0.854 . 0.044 0.001 STAGRN GIBROT STLLPN LRTLPN SCORE SCORE % NOT% NOT Stat ABS ABS ABS ABS Mean1 4.0 6.0 89.0 83.5 Mean2 6.5 8.0 97.265.0 Locs 2 1 5 2 Reps 2 1 5 2 Diff −2.5 −2.0 −8.2 18.5 Prob 0.344 .0.253 0.548

TABLE 4C INBREDS IN HYBRID COMBINATION REPORT Variety #1: HYBRIDCONTAINING PHWRZ Variety #2: 37F73 YIELD GLFSPT YIELD NLFBLT MST BU/A56# SCORE BU/A 56# SCORE PCT Stat ABS ABS % MN ABS ABS Mean1 208.3 4.5107.7 4.5 23.8 Mean2 194.8 5.0 100.5 5.8 23.1 Locs 32 2 32 2 32 Reps 392 39 3 39 Diff 13.5 −0.5 7.2 −1.3 −0.7 Prob 0.000 0.500 0.000 0.3440.023 TSTWT STKCNT GDUSHD GDUSLK PLTHT LB/BU COUNT GDU GDU CM Stat ABSABS ABS ABS ABS Mean1 54.1 53.5 124.5 124.6 283.2 Mean2 55.4 53.6 125.3127.8 274.1 Locs 10 44 11 8 10 Reps 10 53 13 10 12 Diff −1.3 −0.1 −0.9−3.2 9.1 Prob 0.039 0.593 0.426 0.020 0.067 EARHT STAGRN GIBROT STLLPNLRTLPN CM SCORE SCORE % NOT % NOT Stat ABS ABS ABS ABS ABS Mean1 123.54.7 6.0 89.0 83.5 Mean2 119.4 6.2 6.0 88.4 80.0 Locs 10 3 1 5 2 Reps 124 1 5 2 Diff 4.0 −1.5 0.0 0.6 3.5 Prob 0.348 0.225 . 0.952 0.686

TABLE 4D INBREDS IN HYBRID COMBINATION REPORT Variety #1: HYBRIDCONTAINING PHWRZ Variety #2: 35Y54 YIELD GLFSPT YIELD MST TSTWT BU/A 56#SCORE BU/A 56# PCT LB/BU Stat ABS ABS % MN ABS ABS Mean1 218.0 4.5 108.021.9 54.1 Mean2 208.8 5.0 103.6 24.2 53.5 Locs 20 2 20 20 10 Reps 20 220 20 10 Diff 9.2 −0.5 4.4 2.3 0.6 Prob 0.068 0.500 0.084 0.000 0.358STKCNT GDUSHD GDUSLK PLTHT EARHT COUNT GDU GDU CM CM Stat ABS ABS ABSABS ABS Mean1 52.6 127.0 123.0 290.3 127.8 Mean2 51.7 128.8 123.0 285.6115.8 Locs 26 4 1 7 7 Reps 26 4 1 7 7 Diff 0.9 −1.8 0.0 4.7 12.0 Prob0.100 0.069 . 0.303 0.005 STAGRN GIBROT STLLPN LRTLPN SCORE SCORE % NOT% NOT Stat ABS ABS ABS ABS Mean1 4.0 6.0 89.0 83.5 Mean2 5.5 4.0 92.090.0 Locs 2 1 5 2 Reps 2 1 5 2 Diff −1.5 2.0 −3.0 −6.5 Prob 0.205 .0.732 0.315

TABLE 5 PHENOTYPIC DATA FROM HYBRIDS PRODUCED WITH PHWRZ. PRM PRM PRMSHDPRMSHD YIELD YIELD Day Day Day Day bu/a 56# bu/a 56# ABS ABS ABS ABS ABSABS MEAN REPS MEAN REPS MEAN REPS Hybrid 1 99 27 101 27 167.8 20 Hybrid2 98 27 98 27 196.6 16 Hybrid 3 98 53 98 53 195.9 31 Hybrid 4 98 27 10027 179.5 20 Hybrid 5 100 26 102 26 187 16 Hybrid 6 100 26 101 26 207.119 Hybrid 7 102 27 102 27 210.1 9 YIELD YIELD YIELD MST MST MST bu/a 56#bu/a 56# bu/a 56# pct pct pct ABS % MN % MN ABS ABS % MN YRS MEAN REPSMEAN REPS MEAN Hybrid 1 1 92.7 20 19.4 20 96.4 Hybrid 2 1 104.2 16 21.416 99.7 Hybrid 3 1 104.4 31 22.1 31 106.7 Hybrid 4 1 99.4 20 19 20 94.8Hybrid 5 1 100.7 16 21.3 16 101.4 Hybrid 6 1 102.9 19 21.5 19 100.9Hybrid 7 1 106 9 21.3 9 101.2 MST YLDMST YLDMST STLPCN STLPCN STLLPN pctValue Value % NOT % NOT % NOT % MN ABS ABS % MN % MN % MN REPS MEAN REPSMEAN REPS MEAN Hybrid 1 20 96.3 20 101 3 121 Hybrid 2 16 104.5 16 108 1109 Hybrid 3 31 97.7 31 108 1 111 Hybrid 4 20 104.6 20 89 3 99 Hybrid 516 99.3 16 106 1 94 Hybrid 6 19 102 19 112 Hybrid 7 9 104.9 9 84 STLLPNERTLPN ERTLPN LRTLPN LRTLPN TSTWT % NOT % NOT % NOT % NOT % NOT lb/bu %MN % MN % MN % MN % MN % MN REPS MEAN REPS MEAN REPS MEAN Hybrid 1 6 1074 99.6 Hybrid 2 4 235 1 98.7 Hybrid 3 4 111 2 100 1 99.5 Hybrid 4 6 1044 98.2 Hybrid 5 3 103 1 98.9 Hybrid 6 5 112 2 99.7 Hybrid 7 2 90 3 101TSTWT STKCNT STKCNT PLTHT PLTHT EAR HT lb/bu count count in in in % MN %MN % MN % MN % MN % MN REPS MEAN REPS MEAN REPS MEAN Hybrid 1 13 99 2599 8 102 Hybrid 2 10 99 23 99 9 97 Hybrid 3 17 100 51 101 10 99 Hybrid 413 101 25 102 8 101 Hybrid 5 8 99 20 101 5 98 Hybrid 6 11 99 25 100 7 97Hybrid 7 6 100 11 103 4 102 EAR HT BRTSTK BRTSTK BORBMN BORBMN BRLPNE in% NOT % NOT % NOT % NOT % NOT % MN % MN % MN % MN % MN % MN REPS MEANREPS MEAN REPS MEAN Hybrid 1 8 Hybrid 2 9 Hybrid 3 10 63 6 Hybrid 4 8Hybrid 5 5 Hybrid 6 7 Hybrid 7 4 BRLPNE BRLPNL BRLPNL GLFSPT GLFSPTSTAGRN % NOT % NOT % NOT score score score % MN % MN % MN ABS ABS ABSREPS MEAN REPS MEAN REPS MEAN Hybrid 1 4 2 6 Hybrid 2 Hybrid 3 6 Hybrid4 4 2 3 Hybrid 5 4 2 5 Hybrid 6 4 2 6 Hybrid 7 4 1 5 STAGRN HSKCVRHSKCVR ECBLSI ECBLSI score score score score score ABS ABS ABS ABS ABSREPS MEAN REPS MEAN REPS Hybrid 1 3 Hybrid 2 Hybrid 3 2 7 1 Hybrid 4 3Hybrid 5 2 3 1 Hybrid 6 2 Hybrid 7 2

DEPOSITS

Applicant has made a deposit of at least 2500 seeds of Maize VarietyPHWRZ with the American Type Culture Collection (ATCC), 10801 UniversityBoulevard, Manassas, Va. 20110 USA, ATCC Deposit No. PTA-13014. Theseeds deposited with the ATCC on Jun. 26, 2012 were taken from the seedstock maintained by Pioneer Hi-Bred International, Inc., 7250 NW 62^(nd)Avenue, Johnston, Iowa, 50131 since prior to the filing date of thisapplication. Access to this seed will be available during the pendencyof the application to the Commissioner of Patents and Trademarks andpersons determined by the Commissioner to be entitled thereto uponrequest. Upon allowance of any claims in the application, the Applicantwill make the deposit available to the public pursuant to 37 C.F.R.§1.808. This deposit of the Maize Variety PHWRZ will be maintained inthe ATCC depository, which is a public depository, for a period of 30years, or 5 years after the most recent request, or for the enforceablelife of the patent, whichever is longer, and will be replaced if itbecomes nonviable during that period. Additionally, Applicant has orwill satisfy all of the requirements of 37 C.F.R. §§1.801-1.809,including providing an indication of the viability of the sample upondeposit. Applicant has no authority to waive any restrictions imposed bylaw on the transfer of biological material or its transportation incommerce. Applicant does not waive any infringement of rights grantedunder this patent or under the Plant Variety Protection Act (7 USC 2321et seq.). U.S. Plant Variety Protection of Maize Variety PHWRZ has beenapplied for. Unauthorized seed multiplication is prohibited.

REFERENCES

The following references, to the extent that they provide exemplaryprocedural or other details supplementary to those set forth herein, arespecifically incorporated by reference.

-   Aukerman, M. J. et al. (2003) “Regulation of Flowering Time and    Floral Organ Identity by a MicroRNA and Its APETALA2-like Target    Genes” The Plant Cell 15:2730-2741-   Berry et al., Berry, Don et al., “Assessing Probability of Ancestry    Using Simple Sequence Repeat Profiles: Applications to Maize Hybrids    and Inbreds”, Genetics 161:813-824 (2002)-   Berry et al., “Assessing Probability of Ancestry Using Simple    Sequence Repeat Profiles: Applications to Maize Inbred Lines and    Soybean Varieties” Genetics 165:331-342 (2003)-   Boppenmaier, et al., “Comparisons Among Strains of Inbreds for    RFLPs”, Maize Genetics Cooperative Newsletter, 65:1991, p. 90-   Conger, B. V., et al. (1987) “Somatic Embryogenesis From Cultured    Leaf Segments of Zea Mays”, Plant Cell Reports, 6:345-347-   Duncan, D. R., et al. (1985) “The Production of Callus Capable of    Plant Regeneration From Immature Embryos of Numerous Zea Mays    Genotypes”, Planta, 165:322-332-   Edallo, et al. (1981) “Chromosomal Variation and Frequency of    Spontaneous Mutation Associated with in Vitro Culture and Plant    Regeneration in Maize”, Maydica, XXVI:39-56-   Fehr, Walt, Principles of Cultivar Development, pp. 261-286 (1987)-   Green, et al. (1975) “Plant Regeneration From Tissue Cultures of    Maize”, Crop Science, Vol. 15, pp. 417-421-   Green, C. E., et al. (1982) “Plant Regeneration in Tissue Cultures    of Maize” Maize for Biological Research, pp. 367-372-   Hallauer, A. R. et al. (1988) “Corn Breeding” Corn and Corn    Improvement, No. 18, pp. 463-481-   Lee, Michael (1994) “Inbred Lines of Maize and Their Molecular    Markers”, The Maize Handbook, Ch. 65:423-432-   Meghji, M. R., et al. (1984) “Inbreeding Depression, Inbred & Hybrid    Grain Yields, and Other Traits of Maize Genotypes Representing Three    Eras”, Crop Science, Vol. 24, pp. 545-549-   Openshaw, S. J., et al. (1994) “Marker-assisted selection in    backcross breeding”. pp. 41-43. In Proceedings of the Symposium    Analysis of Molecular Marker Data. 5-7 Aug. 1994. Corvallis, O R.,    American Society for Horticultural Science/Crop Science Society of    America-   Phillips, et al. (1988) “Cell/Tissue Culture and In Vitro    Manipulation”, Corn & Corn Improvement, 3rd Ed., ASA Publication,    No. 18, pp. 345-387-   Poehlman et al (1995) Breeding Field Crop, 4th Ed., Iowa State    University Press, Ames, I A., pp. 132-155 and 321-344-   Rao, K. V., et al., (1986) “Somatic Embryogenesis in Glume Callus    Cultures”, Maize Genetics Cooperative Newsletter, No. 60, pp. 64-65-   Sass, John F. (1977) “Morphology”, Corn & Corn Improvement, ASA    Publication, Madison, Wis. pp. 89-109-   Smith, J. S. C., et al., “The Identification of Female Selfs in    Hybrid Maize: A Comparison Using Electrophoresis and Morphology”,    Seed Science and Technology 14, 1-8-   Songstad, D. D. et al. (1988) “Effect of ACC    (1-aminocyclopropane-1-carboyclic acid), Silver Nitrate &    Norbonadiene on Plant Regeneration From Maize Callus Cultures”,    Plant Cell Reports, 7:262-265-   Tomes, et al. (1985) “The Effect of Parental Genotype on Initiation    of Embryogenic Callus From Elite Maize (Zea Mays L.) Germplasm”,    Theor. Appl. Genet., Vol. 70, p. 505-509-   Troyer, et al. (1985) “Selection for Early Flowering in Corn: 10    Late Synthetics”, Crop Science, Vol. 25, pp. 695-697-   Umbeck, et al. (1983) “Reversion of Male-Sterile T-Cytoplasm Maize    to Male Fertility in Tissue Culture”, Crop Science, Vol. 23, pp.    584-588-   Wan et al., “Efficient Production of Doubled Haploid Plants Through    Colchicine Treatment of Anther-Derived Maize Callus”, Theoretical    and Applied Genetics, 77:889-892, 1989-   Wright, Harold (1980) “Commercial Hybrid Seed Production”,    Hybridization of Crop Plants, Ch. 8:161-176-   Wych, Robert D. (1988) “Production of Hybrid Seed”, Corn and Corn    Improvement, Ch. 9, pp. 565-607

The foregoing invention has been described in detail by way ofillustration and example for purposes of clarity and understanding. Asis readily apparent to one skilled in the art, the foregoing are onlysome of the methods and compositions that illustrate the embodiments ofthe foregoing invention. It will be apparent to those of ordinary skillin the art that variations, changes, modifications and alterations maybe applied to the compositions and/or methods described herein withoutdeparting from the true spirit, concept and scope of the invention.

1. Maize variety PHWRZ, representative seed of said variety having beendeposited under ATCC accession number PTA-13014.
 2. A seed of the maizevariety of claim
 1. 3. The seed of claim 2, further comprising atransgenic event.
 4. The seed of claim 3, wherein the transgenic eventconfers a trait selected from the group consisting of male sterility,site-specific recombination, abiotic stress tolerance, alteredphosphorus, altered antioxidants, altered fatty acids, altered essentialamino acids, altered carbohydrates, herbicide resistance, insectresistance and disease resistance.
 5. The seed of claim 2, furthercomprising a locus conversion.
 6. The seed of claim 5, wherein the locusconversion confers a trait selected from the group consisting of malesterility, site-specific recombination, abiotic stress tolerance,altered phosphorus, altered antioxidants, altered fatty acids, alteredessential amino acids, altered carbohydrates, herbicide resistance,insect resistance and disease resistance.
 7. A plant or plant part ofthe maize variety of claim
 1. 8. A maize seed produced by crossing theplant or plant part of claim 7 with a different maize plant.
 9. A maizeplant produced by growing the maize seed of claim
 8. 10. A method forproducing a second maize plant comprising applying plant breedingtechniques to a first maize plant, or parts thereof, wherein said firstmaize plant is the maize plant of claim 9, and wherein application ofsaid techniques results in the production of said second maize plant.11. The method of claim 10, further defined as producing an inbred maizeplant derived from the maize variety PHWRZ, the method comprising thesteps of: (a) crossing said first maize plant with itself or anothermaize plant to produce seed of a subsequent generation; (b) harvestingand planting the seed of the subsequent generation to produce at leastone plant of the subsequent generation; (c) repeating steps (a) and (b)for an additional 2-10 generations to produce an inbred maize plantderived from maize variety PHWRZ.
 12. The method of claim 10, furtherdefined as producing an inbred maize plant derived from maize varietyPHWRZ, the method comprising the steps of: (a) crossing said first maizeplant with an inducer variety to produce haploid seed; and (b) doublingthe haploid seed to produce an inbred maize plant derived from maizevariety PHWRZ.
 13. The plant or plant part of claim 7, furthercomprising a transgenic event.
 14. The plant or plant part of claim 13,wherein the transgenic event confers a trait selected from the groupconsisting of male sterility, site-specific recombination, abioticstress tolerance, altered phosphorus, altered antioxidants, alteredfatty acids, altered essential amino acids, altered carbohydrates,herbicide resistance, insect resistance and disease resistance.
 15. Amaize seed produced by crossing the plant or plant part of claim 13 witha different maize plant.
 16. A maize plant produced by growing the seedof claim
 15. 17. The plant or plant part of claim 7, further comprisinga locus conversion.
 18. The plant or plant part of claim 17, wherein thelocus conversion confers a trait selected from the group consisting ofmale sterility, site-specific recombination, abiotic stress tolerance,altered phosphorus, altered antioxidants, altered fatty acids, alteredessential amino acids, altered carbohydrates, herbicide resistance,insect resistance and disease resistance.
 19. A maize seed produced bycrossing the plant or plant part of claim 17 with a different maizeplant.
 20. A maize plant produced by growing the seed of claim 19.